works for uniform art_var. only half-done for adding 12cu variance to 11fe spectrum.  Due to wavelength mis-match.  Can get around this by using doing this for 1000 bands.  but it's going to be more complicated.  I will wait to implement this idea later.
removed ref_wave as an input parameter for extract_wave_flux_wave().  things seem to continue to work. but inside that function things need to be cleaned up, and notations made more consistent.
works for uniform art_var. only half-done for adding 12cu variance to 11fe spectrum.  Due to wavelength mis-match.  Can get around this by using doing this for 1000 bands.  but it's going to be more complicated.  I will wait to implement this idea later.