AIRTOVAC

       Convert air wavelengths to vacuum wavelengths

       Wavelengths are corrected for the index of refraction of air under
       standard conditions.  Wavelength values below 2000 A will not be
       altered.  Uses the IAU standard for conversion given in Morton
       (1991 Ap.J. Suppl. 77, 119)

       AIRTOVAC, WAVE

       WAVE - Wavelength in Angstroms, scalar or vector
               WAVE should be input as air wavelength(s), it will be
               returned as vacuum wavelength(s).  WAVE is always converted to
               double precision upon return.

       If the air wavelength is  W = 6056.125 (a Krypton line), then
       AIRTOVAC, W yields an vacuum wavelength of W = 6057.8019

       See Morton (Ap. J. Suppl. 77, 119) for the formula used

       Written W. Landsman                November 1991
       Converted to IDL V5.0   W. Landsman   September 1997

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