p>Apply transmission curve on the spectra according to un-redshifted axis.
This is done before we interpolate onto the wavenumbers_syn so that the axis
align properly. Note – the values of the x-axis are not important for this
division since we have already interpolated the transition filter vector
over the UNSHIFTED spectral axis.</p>
</dd></dl>

<dl class="py method">
<dt class="sig sig-object py" id="LUCI.LuciFit.Fit.calc_chisquare">
<span class="sig-name descname"><span class="pre">calc_chisquare</spa