On 07/24/2016 03:55 AM, Samy Ould-Chikh wrote:
I have some issue to import a file in Athena: just a simple x-y column (.txt attached with this email).
Ti K-edge. Data range in the file : 4916.30 up to 5436.88 eV. Issue: only data up to 5260 eV are imported (see screenshot: bug-importation).
Version: Demeter 0.9.24 System: Windows 7 Professional SP1
Well, I hope it's just not me not being able to find a proper way to import the file...
I have a hard time imagining the need for an XAFS scan with 12000 data points. That will usually provides a point density that about an order of magnitude below the core-hole lifetime, maybe 2. In your case, it corresponds to about 0.04 eV steps, which seems silly to me. While I'm quite open to being convinced otherwise, I cannot believe that setting up a scan this way is actually necessary. But, more to the point, I think it is very unprofessional of the beamline staff to send you home with data in a format that is so hard to use. Athena does a pretty good job of importing data in all the crazy-ass formats that beamlines around the world use. But it's not really fair to expect that she can handle anything you can throw at her. If a beamline presents data in a format that is not easy to interpret, it should provide tools for converting the data to a format that can reasonably be interpreted. In your case, the beamline should provide you with a way to rebin the data either onto a more coarse grid or onto something like a "conventional" EXAFS grid. So ... what I recommend, if you want to use Athena (*), is that you find some way to rebin your data onto a grid that fits within the 8192 limit. Athena's rebinning tool uses a simple box car average -- that would suit your data just fine. If you don't know what a box car average is, a google search for "box car average excel", "box car average matlab", "box car average python", etc... should provide a hint. Once you do that, Athena should behave without surprises. B (*) Or use Athena with Larch. Larch does not have the 8192 limit. But you should still process the data onto a sensible grid. B -- Bruce Ravel ------------------------------------ bravel@bnl.gov National Institute of Standards and Technology Synchrotron Science Group at NSLS-II Building 743, Room 114 Upton NY, 11973 Homepage: http://bruceravel.github.io/home/ Software: https://github.com/bruceravel Demeter: http://bruceravel.github.io/demeter/