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| 3 | <title>EXPGUI Tutorial #4</title> |
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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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| 19 | <blockquote> |
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| 20 | |
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| 21 | <CENTER> |
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| 22 | <H1>GSAS Nickel example using EXPGUI (part 4)</H1> |
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| 23 | </CENTER> |
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| 24 | <H1> |
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| 25 | 4. Change a profile parameter |
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| 26 | </H1> |
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| 27 | The next step in the tutorial is to change a profile parameter, |
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| 28 | in this case to widen the range of peaks that are fit. This is done |
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| 29 | by switching to the Profile pane and |
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| 30 | selecting each histogram by selecting it in the box |
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| 31 | to the left. Then change the "Peak cutoff" from 0.01 (1%) to 0.005 |
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| 32 | (0.5%). Note that this change can slow down GSAS significantly, but |
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| 33 | is useful when the the signal-to-noise ratio is very good. |
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| 34 | <img src="profile1.gif"> |
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| 35 | <BR clear=left> |
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| 36 | After the first histogram is modified, select the second histogram |
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| 37 | and modify the "Peak cutoff" there as well. |
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| 38 | <img src="profile2.gif"> |
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| 39 | <BR> |
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| 40 | |
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| 41 | <BR clear=left> |
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| 42 | Previous step: <A HREF="nickel3.html"> |
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| 43 | Add data (histograms) to the Experiment |
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| 44 | </A> |
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| 45 | <BR> |
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| 46 | Next step: <A HREF="nickel5.html"> |
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| 47 | Run POWPREF |
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| 48 | </A> |
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| 49 | |
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| 50 | <HR> |
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| 51 | </blockquote> |
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| 52 | <P><font size=-1><A HREF="MAILTO:crystal@NIST.gov?subject=WWW page <?=$PHP_SELF?>">Comments, corrections or questions: crystal@NIST.gov</A></font><BR> |
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| 53 | <font size=-1><? lastmod(); ?> </font> |
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| 54 | <BR>$Revision: 586 $ $Date: 2009-12-04 23:08:39 +0000 (Fri, 04 Dec 2009) $ |
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| 55 | </body> |
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| 56 | </html> |
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