xsigma outliers when parsing DESI spotgrid psf

desihub / specter

A toolkit for simulating multi-object spectrographs

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xsigma outliers when parsing DESI spotgrid psf #27

Open sbailey opened 8 years ago

sbailey commented 8 years ago

Something is going wrong with calculating the xsigma values of DESI spotgrid PSFs:

from desimodel import io
psf = io.load_psf('r')
ifiber = np.arange(500)
ww = psf.wavelength(ifiber, 2048)
plot(ifiber, [psf.xsigma(i, ww[i]) for i in ifiber])
ylim(1, 1.1)
savefig('bad_xsigma.png')

bad_xsigma