Changeset 209

Timestamp:

Dec 4, 2009 5:02:13 PM (14 years ago)

Author:

toby

Message:

# on 2000/06/09 03:57:42, toby did:
incorporate many useful comments by Egbert Keller

File:

• trunk/tutorial1/nickel6.html (modified) (3 diffs, 3 props)

trunk/tutorial1/nickel6.html

@@ -27 +27 @@
 6. Plot data using POWPLOT or LIVEPLOT
 </H1>
-At this point in the GSAS tutorial in the manual, 
+At this point in the GSAS tutorial 
 program POWPLOT is used to plot the diffraction data. This 
-is done by pressing POWPLOT button in the button bar, or 
+is done in EXPGUI by pressing POWPLOT button in the button bar, or 
 by pressing the POWPLOT menu item in either the Powder menu
 or the Graphs menu. The input supplied to POWPLOT and the
 results are the same as what is shown in the menu, so this will
-not be shown.
+not be repeated here.
 <P>
 EXPGUI does offer another way to display diffraction data, LIVEPLOT.
@@ -42 +42 @@
 <img src="liveplot1.gif" align=left>
 Since no cycles of refinement have been run, 
-after LIVEPLOT generates a blank screen, it must be
+after LIVEPLOT has generated a blank window, it must be
 triggered to read the POWPREF output by pressing the "Update Plot"
 item in the File menu.
-A plot similar to the one to the left.
+A plot similar to the one to the left is then displayed.
+<P>
+The contents of the LIVEPLOT window are discussed more fully 
+<A HREF="#liveplot">
+below</A>, but
+note that the calculated diffraction intensities are all 
+zero at this point, since GENLES
+has not yet been to run to simulate the pattern. 
+Likewise the background values have not yet been fit so 
+this curve is a poor fit. 
+The blue line shows the values of
+obs-calc (diff), offset negatively. The sum of the fixed background 
+values plus the fitted background function is shown 
+difference
+pattern is 
 <BR clear=left><P>
 <img src="liveplot2.gif" align=left>
 Note that the region plotted can be changed by clicking with the left
-mouse button, two outline the region to be shown, as seen to the left.
+mouse button, to outline the region to be shown, as seen to the left.
 When the left mouse button is pressed a second time, the graph is "zoomed in,"
 as is shown below.
@@ -64 +78 @@
 the reflection labels are removed is determined by values in the Options/HKL labeling menu. 
 <BR clear=left><P>
+<I>Do not exit LIVEPLOT at this time as it will be used again in part 8 of this
+tutorial.</I>
+<a name="liveplot">
+<H4>LIVEPLOT Contents and Options</H1>
+</a>
+Note that the observed data points (obs) are marked with "x" symbols in
+LIVEPLOT.
+This can be changed in the Options/Obs symbol menu. The simulated
+diffraction data based on the crystallographic model (calc) is shown as
+a red line. The lower blue line shows the values of
+obs-calc (diff), offset negatively to avoid overlapping with the previous 
+curves. The green line (mostly obscured in this figure) shows the background
+function (bckg). This is the sum of the fixed background 
+values (if any) plus the fitted background function (if used).
+The dashed magenta vertical lines denote reflection positions. The color 
+and lengths of these lines can be customized using the 
+options/Configure Tickmarks menu item, for example, auto placement mode
+creates the more customary short tickmarks placed below the pattern,
+at different heights when more than one phase is present.
+<P>
 There are many other options available in LIVEPLOT in the Options menu. The 
 Appearance and location of the tickmarks can be set. The symbol and symbol size