source: trunk/doc/expgui.html @ 497

Last change on this file since 497 was 497, checked in by toby, 11 years ago

# on 2001/12/16 18:17:32, toby did:
change GSAS version reference
Add La package reference
Expand BLT reference
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1<html>
2<head>
3   <META NAME="Author" CONTENT="Brian H. Toby">
4   <title>EXPGUI</title>
5</head>
6<BODY BGCOLOR="#FFFFFF">
7
8<A HREF=http://www.ncnr.nist.gov>
9<IMG SRC="http://www.ncnr.nist.gov/images/ncnrtrans.gif" 
10alt="Link to NIST Center for Neutron Research home page"
11ALIGN=RIGHT></A>
12<A HREF=http://www.nist.gov>
13<IMG SRC="http://www.ncnr.nist.gov/images/webidblue_2lineright.gif" 
14alt="Link to National Institute of Standards & Technology home page"
15ALIGN=LEFT></A>
16<CENTER>
17<A Href="http://www.ncnr.nist.gov/programs/crystallography/software/tclpkgs.html">
18<IMG SRC="tcltklogo100.gif" 
19alt="Link to Tcl/Tk information">
20</CENTER></A>
21<br clear=all><hr>
22
23<center><h1>
24EXPGUI<BR>
25A Graphical User Interface for
26<A Href="http://www.ncnr.nist.gov/programs/crystallography/software/gsas.html">
27GSAS</A>
28</h1></center>
29<P><P>
30<I><B>
31Note that the current EXPGUI release is intended to work with the
32current GSAS release. (EXPGUI v1.47 or later requires GSAS from Oct 2001,
33or newer for all features to work as described).
34</I></B>
35<P><P>
36EXPGUI is a graphical interface for the
37Los Alamos
38<A Href="http://www.ncnr.nist.gov/programs/crystallography/software/gsas.html">
39GSAS</A> package.
40EXPGUI does two things:
41it can be used to directly modify the GSAS
42experiment file with a graphical user interface (GUI) and
43it can be used to invoke the programs inside the
44GSAS package such as EXPEDT, GENLES, FOURIER...
45These programs can be run from a menu or in many cases by pressing buttons.
46EXPGUI is written using the
47<A href="#tcltk">Tcl/Tk</A> scripting language.
48<P>
49This web page describes the different actions that
50can be accomplished with the different panes and the
51contents of the menus. The table below contains links to the other
52web accessible documentation.
53<P>
54<TABLE BORDER BGCOLOR="#FFFF40" ALIGN=CENTER>
55<TR><TH BGCOLOR="#F0F0F0" rowspan=3>GUI Sections</TH>
56<TH><A Href="expgui1.html">Least Squares</A></TH>
57<TH><A Href="expgui2.html">Phase info</A></TH>
58<TH><A Href="expgui3.html">Histogram info</A></TH>
59</TR>
60<TR>
61<TH><A Href="expgui4.html">Scaling info</A></TH>
62<TH><A Href="expgui5.html">Profile terms</A></TH>
63<TH><A Href="expgui6.html">Constraints</A></TH>
64</TR>
65<TR>
66<TH><A Href="expgui7.html">Preferred Orientation</A></TH>
67<TH><A Href="expguic.html">Menus</A></TH>
68<TH>&nbsp;</TH>
69</TR>
70<TR><TH BGCOLOR="#F0F0F0">Utilities:</TH>
71<TH><A Href="liveplot.html">LIVEPLOT</A></TH>
72<TH><A Href="liveplot.html">BKGEDIT</A></TH>
73<TH><A Href="excledt.html">EXCLEDT</A></TH>
74</TR>
75<TR><TH BGCOLOR="#F0F0F0">Installation Notes:</TH>
76<TH><A Href="expgui_Unix_readme.html">Unix</A></TH>
77<TH><A Href="expgui_Win_readme.html">Windows</A></TH>
78<TH><A Href="expgui_cfg.html">Customization</A></TH>
79</TR>
80<TR><TH BGCOLOR="#F0F0F0">Tutorials:</TH>
81<TH><A Href="http://www.ncnr.nist.gov/xtal/software/expgui/tutorial1/index.html">TOF</A></TH>
82<TH><A Href="http://www.ncnr.nist.gov/xtal/software/expgui/tutorial2/index.html">CW Neutron</A></TH>
83<TH>&nbsp;</TH>
84</TR>
85<TR><TH BGCOLOR="#F0F0F0">Messages:</TH>
86<TH><A Href="expguierr.html#Error">Error</A></TH>
87<TH><A Href="expguierr.html#Warn">Warning</A></TH>
88<TH><A Href="expguierr.html#Info">Informational</A></TH>
89</TR>
90<TR><TH BGCOLOR="#F0F0F0">Other:</TH>
91<TH><A Href="expgui_intro.html">Introduction</A></TH>
92<TH><A Href="wishlist.html">Recent & Planned<BR>Improvements</A></TH>
93<TH><A Href="http://www.ncnr.nist.gov/xtal/software/EXPGUI_reprint.pdf">
94<I>J. Appl. Cryst.</i><BR>article</A></TH>
95</TR>
96</TABLE><BR CLEAR=ALL>
97<P>
98<B>Citations.</B>
99The appropriate citations to be used for GSAS and EXPGUI are:
100<UL>
101<LI>
102A.C. Larson and R.B. Von Dreele, "General Structure Analysis System (GSAS)",
103Los Alamos National Laboratory Report LAUR 86-748 (2000).
104<A HREF="ftp://ftp.lanl.gov/public/gsas/manual/GSASManual.pdf">
105[link to PDF file at Los Alamos ftp server]
106</A>
107<LI>
108B. H. Toby, <i>EXPGUI</i>, a graphical user interface for <i>GSAS</i>,
109<i>J. Appl. Cryst.</i> <b>34</b>, 210-213 (2001).
110<A HREF="http://www.ncnr.nist.gov/xtal/software/EXPGUI_reprint.pdf">
111[link to PDF file]
112</A>
113</UL>
114<P>
115<B>Mailing List.</B>
116If you would like to get news about about new features
117& bug fixes in EXPGUI and also support
118the project by demonstrating how many people use it,
119please send e-mail to
120<a href="mailto:brian.toby@nist.gov?subject=EXPGUI Mailing List">Brian.Toby@NIST.GOV</a>.
121<P>
122<hr>
123
124<h2>A. Experiment file editing</h2>
125<P>
126<DL><DL>
127When an experiment (.EXP) file is read, a copy is made in local
128computer memory. In most cases, values are changed in this
129"in memory" copy of the experiment file
130as this information is changed by the user on the screen.
131<img SRC="rederror.gif" align=LEFT BORDER=3 alt="EXPGUI Screen snapshot">
132<IMG SRC="new.gif" HEIGHT=13 WIDTH=36 alt="New!">
133If there is an error in the typed value, (for example if "1..0" is typed, or
134"1.5" is typed where an integer is expected), these values are
135not saved. In this case, the text is turned red, to indicate
136that an error is present, as shown in the figure to the left, where "90.000x"
137has been entered for alpha.
138The edited version of the experiment file is written back out to
139disk when the "File/Save" or "File/Save as"
140<A Href="expguic.html#1">menu bar options</A>
141are used. The File/Save operation is done automatically before any GSAS
142programs, such as GENLES or EXPEDT, are run.
143<P>
144
145Since the GSAS experiment file is quite complex,
146values are grouped together by function, approximately
147following the outline of the EXPEDT program.
148Each set of values is given a
149"tabbed pane" on a window that has the appearance of a notebook (see below).
150<center><B>
151<br>The notebook pane tabs.
152<br><img SRC="panebar1.gif"  BORDER=3 alt="EXPGUI Screen snapshot">
153</center></B>
154In some cases, where values are
155too numerous or complex to fit onto the notebook pane, one or more buttons
156may be present on a pane that will create a separate window,
157where the associated values can be modified.
158These values are not recorded in the
159"in memory" copy of the experiment file unless the "Save" button on this window
160is pressed. If "Cancel" is pressed, no changes are made.
161Each notebook pane is listed below with a link to the web page documenting
162that pane.
163
164<A Href="expgui1.html">
165<h3>A.1 Least Squares (LS) Controls Pane</h3>
166</A><A Href="expgui2.html">
167<h3>A.2 Phase Pane</h3> 
168</A><A Href="expgui3.html">
169<h3>A.3 Histogram pane</h3> 
170</A><A Href="expgui4.html">
171<h3>A.4 Scaling pane</h3> 
172</A><A Href="expgui5.html">
173<h3>A.5 Profile pane</h3> 
174</A><A Href="expgui6.html">
175<h3>A.6 Constraints pane</h3>
176</A><A Href="expgui7.html">
177<h3>A.7 Preferential Orientation Pane</h3>
178</A>
179<br clear=all>
180</DL></DL>
181<h2>B. Shortcuts</h2></a>
182<a name="multiplehistogram">
183<h3>B.1 Multiple Histogram Selection</h3></a>
184<DL><DL>
185This mode allows parameters to be changed for groups of
186histograms.
187When the "Multiple Histogram Selection" mode is off,
188it is possible to modify parameters
189and refinement flags for only a single histogram, but
190the other settings allow groups of histograms
191to be selected and modified.
192<A href="#mouseactions">(see Mouse Actions)</A>.
193<P>
194It does not make sense, however, to globally modify
195instrument-related parameters and flags for different
196histogram types.
197So global actions can be limited to a single class
198of histogram types (e.g. TOF, CW Neutron,...), which
199allows these parameters to be set for groups of
200similar histograms. Thus, if this mode is set to "All"
201the Histogram and Profile panes are disabled.
202<P>
203The setting for "Multiple Histogram Selection" mode is
204displayed above each histogram selection box and is
205selected using the "Multiple Hist. Selection" item on the
206Options menu to create a submenu or by clicking on the display.
207Note that another option in this "Multiple Hist. Selection"
208submenu is an option "Group Phases Together" that controls how
209EXPGUI treats phases having
210the same profile type that is used when multiple histograms are selected. If
211the "Group Phases Together" option is on, then the refinement flags for
212all phases with the same histogram types are grouped together, when possible.
213If this option is off, phases are treated separately.
214<IMG SRC="new.gif" HEIGHT=13 WIDTH=36 alt="New!">
215If the left mouse button is used to click on the selection mode display,
216the mode is cycled between the available modes. If the right mouse
217button is used, the mode is reset, to disable multiple histogram selection.
218<p>
219<a name="mouseactions">
220</DL></DL>
221<h3>B.2 Mouse Actions</h3></a>
222<DL><DL>
223A range of atoms or (in multiple selection mode) histograms may be
224selected by dragging (holding down) the left mouse button. It is also
225possible to select a range by using the Shift key with the left mouse
226button. To select or deselect individual entries, use the Control key
227with the left mouse button. Pressing the right mouse button selects all
228entries in a list.
229</DL></DL>
230
231<h2>C. Menu Commands and Programs</h2>
232<p>
233GSAS programs are invoked either through use of the menu bar
234<center><B>
235<br>The menu bar.
236<br><img SRC="menubar.gif" BORDER=3 alt="EXPGUI Screen snapshot">
237</center></B>
238or by "pressing" a button on the button bar. The button bar
239simply provides an easy way to access commonly used
240actions on the menu bar. Users can
241<A HREF="expgui_cfg.html">
242configure the menu bar</A> to include their own preferred actions and, with
243some knowledge of the program and Tcl/Tk,
244add their own commands to the menu bar or button bar.
245
246<center><B>
247<br>The button bar.
248<br><img SRC="buttonbar.gif" BORDER=3 alt="EXPGUI Screen snapshot">
249</center></B>
250
251<h3>Invoking of GSAS programs</h3>
252When GSAS programs are invoked, in most cases EXPGUI is suspended while
253the GSAS program is run in a terminal (or DOS) window. When the terminal
254window is closed, EXPGUI is restarted. If desired (see the
255<A Href="expguic.html#Autoicon">
256"Iconify during GSAS"</A>
257option) while this occurs, EXPGUI can be made into an icon
258to save screen space.
259<P>
260<img src="powpref4a.gif" align=left>
261Once the GSAS program has finished, if the program has modified
262the .EXP file,
263<a Href="expguierr.html#Overwrite">
264"File has been modified..."</a>message box
265similar to the one to the left is displayed (also see the more complete
266discussion on the <a Href="expguierr.html#Overwrite">messages page</A>.
267Note that this message can be avoided if the
268<A Href="expguic.html#Autoupdate">
269"Autoload EXP"</A>
270option is used.
271<BR clear=all>
272<P>
273Note that in both Windows-95 and Windows-NT, a file named <tt>EXPGUI.LCK</tt>
274is created while the GSAS program runs. The presence of this file is used
275to suspend the LIVEPLOT program, since LIVEPLOT has sometimes crashed
276when run at the same time as GENLES (no such problem has been seen in Unix).
277This file is deleted when the GSAS program completes.
278<P>
279<img src="lock.gif" align=left>
280In Windows-9x, the <a Href="expgui_Win_readme.html#Winexec">Winexec</a>
281package is used to execute a command that creates a DOS window.
282The GSAS programs are then run by a batch file in this DOS window.
283Due to limitations in Tcl/Tk & Windows, the DOS window runs independently
284of EXPGUI, so the lock file (<tt>EXPGUI.LCK</tt>) is also used to suspend
285EXPGUI. While EXPGUI is waiting, the
286<a Href="expguierr.html#lock">
287Please wait...
288</a>
289window shown to the left is displayed. When the GSAS program completes, the
290lock file is deleted, the window automatically disappears and EXPGUI resumes.
291Should a problem arise where the file is not deleted, EXPGUI can be resumed by
292pressing the "Continue" button.
293
294<BR clear=all>
295<h3>GSAS menus</h3>
296
297A description of the EXPGUI menus follows. Use the links to obtain
298more information, including a very
299brief description of the function of each menu option.
300Note that an option may appear under more than one menu.
301
302<DL><DL>
303
304<A Href="expguic.html#1">
305<H3>C.1 File Menu</H3>
306</A>
307<DL><DL>
308The options on the File menu as is the custom contains the commands
309for reading and writing experiment files, as well as starting
310and ending the program.
311</DL></DL>
312
313<A Href="expguic.html#2">
314<h3>C.2 Options Menu</h3>
315</A>
316<DL><DL>
317This menu contains options that determine how EXPGUI runs.
318</DL></DL>
319
320<A Href="expguic.html#3">
321<h3>C.3 Powder Menu</h3>
322</A>
323<DL><DL>
324This menu contains links to GSAS programs used for powder diffraction
325analysis.
326</DL></DL>
327
328<A Href="expguic.html#4">
329<h3>C.4 Single Crystal Menu</h3>
330</A>
331<DL><DL>
332This menu contains links to GSAS programs used for
333single-crystal diffraction analysis.
334</DL></DL>
335
336<A Href="expguic.html#5">
337<h3>C.5 Graphics Menu</h3>
338</A>
339<DL><DL>
340This menu contains links to several GSAS and
341two non-GSAS (LIVEPLOT and WIDPLT)
342programs used for graphical display of data and results.
343</DL></DL>
344
345<A Href="expguic.html#6">
346<h3>C.6 Results Menu</h3>
347</A>
348<DL><DL>
349This menu contains links to several GSAS and
350one non-GSAS (LSTVIEW)
351programs used for analysis of results.
352</DL></DL>
353
354<A Href="expguic.html#7">
355<h3>C.7 Calculations Menu</h3>
356</A>
357<DL><DL>
358This menu contains programs for useful crystallographic computations.
359</DL></DL>
360
361<A Href="expguic.html#8">
362<h3>C.8 Import/Export Menu</h3>
363</A>
364<DL><DL>
365This menu contains utilities for importing information into GSAS and
366exporting.
367</DL></DL>
368</DL></DL>
369
370<h2>D. EXPGUI Utility Programs</h2></a>
371
372<br clear=all>
373<H3>D.1 LSTVIEW</H3>
374
375<DL><DL>
376LSTVIEW is used to browse through the GSAS output listing. It is
377invoked by the "lstview" command in the GUI.
378<CENTER><IMG SRC="textview.gif" alt="EXPGUI Screen snapshot"></CENTER>
379</DL></DL>
380
381<br clear=all>
382<H3>D.2 LIVEPLOT</H3>
383<DL><DL>
384LIVEPLOT shows the observed, calculated and difference plots for powder
385refinements. The plot is updated as the refinement progresses. The mouse can
386be used to zoom in on sections of the plot.
387LIVEPLOT uses the <A href="#blt">BLT</A> graphics package.
388<CENTER><IMG SRC="liveplot.gif" alt="EXPGUI Screen snapshot"></CENTER>
389<IMG SRC="new.gif" HEIGHT=13 WIDTH=36 alt="New!">
390LIVEPLOT can now be enhanced to superimpose peak locations for
391input unit cells or peaks from JCPDS/ICDD entries.
392See the <A HREF="liveplot.html#customize">
393LIVEPLOT customization information</A> 
394or read file <tt>expgui_cfg.html</tt> in the <tt>gsas/tcl/doc</tt> directory.
395<P>
396</DL></DL>
397
398<br clear=all>
399<H3>D.3 WIDPLT</H3>
400<DL><DL>
401WIDPLT can be used to plot the actual peak widths generated by the profile
402parameters used in GSAS.
403It is possible to define reference curves
404that are loaded automatically.
405WIDPLT uses the <A href="#blt">BLT</A> graphics package.
406<CENTER><IMG SRC="widplt.gif" alt="EXPGUI Screen snapshot"></CENTER>
407</DL></DL>
408
409<br clear=all>
410<a name="ConvertUnix"></a>
411<a name="ConvertWin"></a>
412<h3>D.4 File Conversions</h3> 
413<DL><DL>
414<P>
415GSAS data, experiment and instrument parameter files are
416expected to have a format with exactly 80 characters per line followed
417by a carriage return and then a linefeed (82 characters total per line).
418Files in this format can be read in "Direct Access" mode.
419Recent versions of GSAS will attempt to detect and repair files that
420are not in this format, but if the file is incorrectly formatted and
421by chance the length of the file is divisible by 82, the problem in the
422file format will not be detected.
423The Convert menu
424in can be used to convert files into the correct format.
425The original version of the
426file is retained and renamed.
427<P>
428</DL></DL>
429
430<br clear=all>
431<a name="Composition"></a>
432<h3>D.5 Compute Composition</h3> 
433<DL><DL>
434The composition box shows the unit cell and asymmetric unit composition
435for all phases in a material. Site multiplicities and occupancies are
436taken into account.
437</DL></DL>
438
439<br clear=all>
440<a name="ExportMSI"></a>
441<h3>D.6 Export coordinates in MSI .xtl format</h3> 
442<DL><DL>
443The Export/exp2xtl routine writes a .xtl file, as is used in Insight-II and
444Cerius2 (Molecular Simulations, Inc.). Note that space groups are not named
445exactly the same in the two programs and the origin may need to be specified
446as "origin 2", for space groups where the center of symmetry is not at the
447origin. It is up to the user to get things right.
448</DL></DL>
449
450<br clear=all>
451<a name="DeleteHistoryRecords"></a>
452<h3>D.7 Delete History Records</h3> 
453<DL><DL>
454Every time a GSAS program (including EXPGUI) is run, an entry is added to
455the "history records" in the .EXP file. After 999 entries have been written,
456no more can be added to the file. Further, reading large numbers of history
457records can slow the GSAS programs
458(this is less of a problem on faster computers). For these reasons, it may be
459a good idea to prune the older history records from the file. If more than 100
460history records are found in an experiment file, EXPGUI suggests that the
461older history entries be deleted. Alternately the File/EraseHistory command
462can be used to invoke the this option.
463<P>
464On the dialog the number of history records to be retained is specified.
465Also, after records have been deleted, the remaining records can be renumbered
466starting with 1, so that the 999 record limit is not reached.
467</DL></DL>
468
469<A name=tcltk>
470<H2>
471<A Href="http://www.ncnr.nist.gov/programs/crystallography/software/tclpkgs.html">
472Tcl/Tk</A></H2>
473The
474<A Href="http://www.ncnr.nist.gov/programs/crystallography/software/tclpkgs.html">
475Tcl/Tk program</A> is a platform-independent scripting language that is
476used to implement most of EXPGUI. This software is available for free
477and must be loaded in order to use EXPGUI. See the
478installation notes for
479<A HREF="expgui_Win_readme.html">Windows</A>,
480and for
481<A HREF="expgui_Unix_readme.html">UNIX</A> for information on how to do this.
482While learning Tcl/Tk is a great thing to do, it is not a requirement
483for using or installing EXPGUI.
484
485<A name=winexec>
486<H3>
487WINEXEC</H3>
488<UL>
489The WINEXEC package is needed under Windows-95 and its offspring
490(-98 and -ME). See the <A HREF="expgui_Win_readme.html">Windows installation
491notes</A> for more details.
492</UL>
493
494<A name=blt>
495<H3>
496BLT Package</H3>
497<UL>
498The BLT graphics package is used by the WIDPLT, LIVEPLOT, BKGEDIT & 
499EXCLEDT routines. If the
500package can not be found by these routines, an error message,
501"Error -- Unable to load the BLT package", will be displayed. It is also
502possible for the package to be installed, but not configured properly.
503If this is the case, a message,
504"BLT Setup Error: could not access a Blt_ routine...", will be displayed.
505This is most common in UNIX and is discussed further in the
506<A HREF="expgui_Unix_readme.html">UNIX installation notes</A>. Also see
507<A HREF="http://www.ncnr.nist.gov/programs/crystallography/software/tclpkgs.html">
508http://www.ncnr.nist.gov/programs/crystallography/software/tclpkgs.html
509</A> for more information on installation of BLT.
510</UL>
511
512<A name=La>
513<H3>
514La (Linear Algebra) Package</H3>
515<UL>
516The
517<A HREF="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=www.hume.com">Hume
518</A>
519Linear Algebra Tcl Package,
520<A HREF="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=www.hume.com">
521La</A>,
522is used by the BKGEDIT
523routine to perform least-squares fitting. If the
524package can not be found, the routine cannot run.
525If the package cannot be found, a message,
526"Error -- Unable to load the La package" will be displayed. This
527should not happen, since the package is included with the EXPGUI files.
528So if get this error you probably have an incomplete installation.
529Note that the La package requires Tcl/Tk version 8.1 or higher, so that if
530you are using an older version of Tcl/Tk, you will need to upgrade.
531See the installation instructions for
532<A HREF="expgui_Win_readme.html">Windows</A>,
533and for
534<A HREF="expgui_Unix_readme.html">UNIX</A> for more information on Tcl/Tk.
535</UL>
536
537<H2>
538Acknowledgments</H2>
539Praise to Larson and
540<A HREF="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://lansce.lanl.gov/lujan/staff12/vondreele.htm">
541Von Dreele</A> for GSAS, <A HREF="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.scriptics.com/">Ousterhout</A>
542for Tcl/Tk,
543Przemek Klosowski</A>
544for convincing me to learn Tcl/Tk
545and Jonathan Wasserman for helping get this project started.
546Thanks also to
547Pamela Whitfield of the NRC (Canada) for writing large
548sections of the
549<A Href="expgui7.html">Preferential Orientation Pane</A>
550and the
551<A Href="expgui6.html">Profile Constraints pane</A>
552code.
553<P>
554<A Href="http://www.ncnr.nist.gov/programs/crystallography/software/gsas.html">
555GSAS</A>
556is written by Allen C. Larson and <A HREF="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://lansce.lanl.gov/lujan/staff12/vondreele.htm">
557Robert B. Von Dreele</A>, MS-H805,
558Los Alamos National Laboratory, Los Alamos, NM 87545. Problems, questions
559or kudos concerning GSAS should be sent to Robert B. Von Dreele at
560<A HREF="MAILTO:vondreele@lanl.gov">vondreele@lanl.gov</A>
561EXPGUI is written by Brian H. Toby of the NIST Center for Neutron Research,
562<A HREF="MAILTO:Brian.Toby@NIST.GOV">Brian.Toby@NIST.GOV</A> 
563with help from Jonathan Wasserman.
564
565<P>GSAS is Copyright, 1984-2000, by
566the Regents of the University of California.
567The GSAS software was produced under a U.S. Government contract (W-7405-ENG-36)
568by the Los Alamos National Laboratory, which is operated by the University
569of California for the U.S. Department of Energy. The U.S. Government is
570licensed to use, reproduce, and distribute this software. Permission is
571granted to the public to copy and use this software without charge, provided
572that this notice and any statement of authorship are reproduced on all
573copies. Neither the Government nor the University makes any warranty, express
574or implied, or assumes any liability or responsibility for the use of this
575software.
576
577<P>The author of EXPGUI is a U.S. Government employee which means that
578EXPGUI is not subject to copyright. Have fun with it. Modify it. Please write
579new sections and make them available to the rest of the world.
580
581<p>Neither the U.S. Government nor any author makes any warranty,
582expressed or implied, or assumes any liability or responsibility
583for the use of this information or the software described
584here. Brand names cited herein are used for
585identification purposes and do not constitute an endorsement by NIST.
586
587<p><hr><a href="http://www.ncnr.nist.gov/staff/toby/">Brian Toby</a> (<a href="mailto:brian.toby@nist.gov">Brian.Toby@NIST.GOV</a>)
588<br>
589$Revision: 497 $ $Date: 2009-12-04 23:07:09 +0000 (Fri, 04 Dec 2009) $
590</body>
591</html>
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