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| 2 | <head> |
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| 3 | <title>EXPGUI Tutorial #5</title> |
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| 5 | |
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| 7 | A:link {text-decoration:none} |
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| 11 | <BODY BGCOLOR="#FFFFFF" |
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| 13 | text="#000000" link="#0033ff" vlink="#0033ff" alink="#0033ff"> |
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| 14 | |
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| 15 | <? |
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| 16 | include("/var/www/include/navigation.inc"); |
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| 17 | include("/var/www/include/utility.inc"); |
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| 18 | ?> |
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| 19 | <blockquote> |
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| 20 | |
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| 21 | <CENTER> |
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| 22 | <H1>EXPGUI Tutorial: Garnet (part 5)</H1> |
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| 23 | </CENTER> |
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| 24 | <H1> |
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| 25 | 5. Plot data using POWPLOT or LIVEPLOT |
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| 26 | </H1> |
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| 27 | At this point in the GSAS tutorial in the manual, |
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| 28 | program POWPLOT is used to plot the diffraction data. This |
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| 29 | is done by pressing POWPLOT button in the button bar, or |
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| 30 | by pressing the POWPLOT menu item in either the Powder menu |
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| 31 | or the Graphs menu. The input supplied to POWPLOT and the |
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| 32 | results are the same as what is shown in the menu, so this will |
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| 33 | not be shown. |
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| 34 | <P> |
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| 35 | EXPGUI does offer another way to display diffraction data, LIVEPLOT. |
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| 36 | Similar to the way POWPREF was run in the previous step, |
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| 37 | LIVEPLOT can be started by pressing LIVEPLOT button in the button bar, |
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| 38 | or by pressing the LIVEPLOT menu item in the Graphs menu. |
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| 39 | <P> |
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| 40 | <a name="diff"> |
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| 41 | <img src="lp1.gif"></a> |
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| 42 | <BR clear=left> |
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| 43 | Since two cycles of refinement have been run, |
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| 44 | LIVEPLOT generates a plot similar to the one above, showing the |
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| 45 | observed data (black X's), simulated (computed) data (red line), the fitted |
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| 46 | background (green line) and the difference between the observed and computed |
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| 47 | data (lower black line), |
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| 48 | <BR clear=left><P> |
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| 49 | <img src="lp2.gif"> |
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| 50 | <BR clear=left> |
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| 51 | Note that the region shown in the plot |
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| 52 | can be changed by clicking with the left |
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| 53 | mouse button to outline a region, as shown above. |
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| 54 | When the left mouse button is pressed a second time, the graph is "zoomed in," |
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| 55 | as is shown below. |
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| 56 | To "zoom out" to the previous region, press the right mouse button. |
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| 57 | <BR clear=left><P> |
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| 58 | <img src="lp3.gif"> |
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| 59 | <BR clear=left><P> |
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| 60 | <img src="lp4.gif"> |
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| 61 | <BR clear=left> |
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| 62 | Reflection positions can be marked, using the File/Tickmarks menu. |
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| 63 | Likewise, reflection indices can be displayed by pressing the "h" (or "H") key in the |
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| 64 | position of the reflection to be labeled. |
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| 65 | The size and time before |
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| 66 | the reflection labels are removed is determined by values in the Options/HKL labeling menu. |
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| 67 | <BR clear=left><P> |
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| 68 | There are many other options available in LIVEPLOT in the Options menu. The |
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| 69 | Appearance and location of the tickmarks can be set, |
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| 70 | for example, using the "Options/Configure Tickmarks/Auto locate option |
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| 71 | causes the tickmarks to be shown as |
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| 72 | <A HREF="garnet6.html#ticks">small lines under each reflection.</A> |
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| 73 | The symbol and symbol size |
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| 74 | used for observed data can be selected. |
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| 75 | The X and Y units can be changed to Q or d-space values. Background |
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| 76 | can be subtracted. The legend can be removed from the plot. |
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| 77 | |
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| 78 | <BR clear=left><HR> |
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| 79 | Previous step: <A HREF="garnet4.html"> |
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| 80 | Run POWPREF and GENLES</A> |
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| 81 | <BR> |
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| 82 | Next step: <A HREF="garnet6.html"> |
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| 83 | Additional Least-Squares Refinement</A> |
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| 84 | |
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| 85 | <HR> |
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| 86 | </blockquote> |
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| 87 | <P><font size=-1><A HREF="MAILTO:crystal@NIST.gov?subject=WWW page <?=$PHP_SELF?>">Comments, corrections or questions: crystal@NIST.gov</A></font><BR> |
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| 88 | <font size=-1><? lastmod(); ?> </font> |
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| 89 | <BR>$Revision: 597 $ $Date: 2009-12-04 23:08:50 +0000 (Fri, 04 Dec 2009) $ |
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| 90 | </body> |
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| 91 | </html> |
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