I do not recommend using this format. Better choices are the ESD
variant on this, where numbers are alternated intensity, esd,
intensity... (and there are a lot more digits for each number) or
the
FXYE format, which has angle, intensity, and optionally esd, one
entry per line in free format.
My recollection on this is that YO is the total number of counts, so
the normalized Intensity = YO/n and the error on that is SQRT(YO)/n.
The idea being that not all measurements are made with the same
number of detectors.
Brian
On Mar 16, 2009, at 12:02 AM, matthew.row...@csiro.au wrote:
Hi all
I'm going over the GSAS data format (by reading the manual), trying
to figure out how it works, and I've come up with a couple of
questions:
1) In a STD data set, the manual says that NCTR is the number of
counters and YO is the n number of counts per counter.
So, for a single data point " 3 3452", is the total counts =3*3452?
What is the error? Sqrt(3*3452), 3*sqrt(3452) or sqrt(3452/3)?
2) What is the data format for type = "ALT"? The manual (http://
www.ccp14.ac.uk/ccp/ccp14/ftp-mirror/gsas/public/gsas/manual/
GSASManual.pdf) doesn't say...
Cheers
Matthew
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Matthew Rowles
CSIRO Minerals
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AUSTRALIA 3169
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Fax: +61 3 9562 8919 (site)
Email: matthew.row...@csiro.au
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Senior Physicist/Materials Characterization Group Leader
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