Thanks for the response! For clarification, I'm not really trying to re-normalize the normalized data, which is flattened in this case. However, I'm having (terminal) difficulty extracting the EXAFS from the normalized groups, because I can't seem to get the program to pass a spline through it (even though the spline will pretty much be a straight line) and gimme my EXAFS! All caution will of course be applied in the use of said EXAFS, if I can get that far...! Cheers, thanks again, Mike
On Oct 15, 2016, at 1:25 PM, Anatoly Frenkel
wrote: I would try to rename .norm by .xmu and see if it will be able to do what you want. I would still be cautious doing it because .norm means that the raw data was already altered (pre-edge function was subtrated and slope changed). Doing anything like that is possible but not wise because it is not guaranteed that you would obtain the same result as when you start from the raw data directly.
For example, suppose "norm1" is normalization operation with one set of parameters, and "norm2" - with another. Xmu is the raw absorption coefficient data (obtained from the ratio of detector signals). It is not likely that norm2 (xmu) will give the same results as norm2(norm1(xmu)), although the differences may be small. That is the reason, I think, Athena does not allow any ex post factum normalization to the normalized data.
Anatoly Frenkel Stony Brook University
On Oct 15, 2016 4:10 PM, "Mike Massey"
wrote: Hi everyone, Apologies if this has been covered before, I'm just getting around to upgrading to Demeter. I have a bunch of old project files with a mishmash of data from different sources, and I'm having trouble getting them to work fully with the new software.
Any group with a data type of "xmu" (energy space) seems to work as expected, but any group with a data type of "norm" (normalized data) doesn't seem to work properly when it comes to spline or post-edge background subtraction (which is handy if I want to do LCF, for example). Is this a bug or a feature? Has anybody yet developed a workaround?
Any thoughts or advice would be greatly appreciated. The ultimate workaround is to use different data, but I'd like to use existing projects if possible (saves a lot of time and brain damage).
Cheers, and thanks!
Mike
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