Dear Matt
Thank you for your reply. I confirmed that chi (k) becomes smooth by the Savitzky-Goley method by doing the attached lar file. I will try on various conditions from now. I may also ask if there is something I do not understand. Thank you for your help again! Bests, Yuji Mahara From: Ifeffit [mailto:ifeffit-boun...@millenia.cars.aps.anl.gov] On Behalf Of Matt Newville Sent: Thursday, April 20, 2017 5:26 AM To: XAFS Analysis using Ifeffit <ifeffit@millenia.cars.aps.anl.gov> Subject: Re: [Ifeffit] The difference of EXAFS oscillation when using Athena and when using Larch Hi Yuji, The attached larch script (a modification of your script but note: not python, so you may have to add a bunch of '_larch=mylarch' arguments) to show the effects of smoothing with Savitzky-Golay and of interpolating onto a "classic XAFS energy grid". You might want to play around with this different options. It definitely seems that none of these methods are systematically over-smoothing the data and reducing the amplitudes of the oscillations -- one more reason to use Larch instead of Ifeffit. But it also seems like smoothing this data with a Savitzky-Golay fitler is helpful. Also attached are plots showing k- and R-space generated from the attached script. --Matt
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