The 2D spectra (output by makee) have a wavelength scale for each
echelle order specified by a 6th order polynomial of the form:
wavelength in Angstroms = coef(0) + coef(1)*pixel + coef(2)*pixel*pixel + ...
where pixel is the column number.
For each order, two FITS header cards are added. The two card names
have the format: WV_0_## and WV_4_## where "##" is the echelle order
number on a scale where the bluest order of a given exposure is number 01.
Each card contains four values:
WV_0_## = ' coef(0) coef(1) coef(2) coef(3) '
WV_4_## = ' coef(4) coef(5) coef(6) coef(7) '
WV_0_05 = ' 3.798860003E+03 +2.866401731E-02 -7.524915946E-07 -8.422777264E-11'
WV_4_05 = ' 8.209366207E-14 -5.373050237E-17 +1.107868830E-20 +0.000000000E+00'