This already happens in Athena. It was requested back in 2014:
https://www.mail-archive.com/ifeffit@millenia.cars.aps.anl.gov/msg04747.html
and Bruce did include energy as a column in the exported chi file in a future release
(present in 0.9.26)...e.g.
# XDI/1.0 Athena/0.9.26
# Element.edge:                  K
# Element.symbol:                Fe
# Column.1:                      k inverse Angstrom
# Column.2:                      chi
# Column.3:                      chik
# Column.4:                      chik2
# Column.5:                      chik3
# Column.6:                      window
# Column.7:                      energy

-R.

On 9/15/2017 6:32 AM, Matt Newville wrote:

Hi Michael,

On Fri, Sep 15, 2017 at 8:21 AM, Michael Stockenhuber <michael.stockenhuber@newcastle.edu.au> wrote:

Dear mailing list,

Is there any way to save data as Chi( E),i.e., energy one column and chi(E) in the 2^nd column? This was possible in the past and it would be great to have that to be able to import into excurv.

Sure:

~> larch

larch> dat = read_ascii(datafile_name)

larch> # ... make sure you have mu(E) as 'dat.energy' and 'dat.mu'

larch> autobk(dat, rbkg=1.0, kweight=1) # may want other options

larch> write_ascii('my_chie.txt', dat.energy, dat.chie)

larch> plot(dat.energy, dat.chie, xlabel='E (eV)', ylabel=r'$\chi(E)$')

Hope that helps,

--Matt
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