Turns out freedom and flexibility are great for coding.
SPAN now handles air and vacuum wavelength more easily. Two new functions in the Spectra manipulation panel allow to convert the wavelengths from air to vacuum and vice versa. The wrappers to pPXF can ...
some header rows,,,... x,y1,y2,y3 0,0,2,3 1,1,1,2 2,3,2,3 3,1,2,3 4,0,3,4 5,0,2,1 some footer rows,,, ...