Syntax: xyfits (x-y pair file) (FITS file) [options] Converts a file containing wavelength,flux pairs into a a FITS spectrum file. One x-y pair per line, do NOT put the number of pixels on the first line. Options: ord=n : specifies the order (1-6) of the polynomial wavelength scale, default=1 (linear scale). -lfl : Convert to lamba*f(lambda). ef=filename : Assumes third column are flux errors, writes out the error spectrum to "filename". hf=filename : Takes initial header cards from this file, one card per line. -MKS : Put wavelengths in meters. -plot : Plot residuals. -ps : Plot residuals in PostScript file "junk.ps".