NAME:
   getsalb
 PURPOSE: (one line)
   Solve for single scattering albedo given bi-directional reflectance
 DESCRIPTION:
 CATEGORY:
   Miscellaneous
 CALLING SEQUENCE:
   ans = getsalb(bidref,emu,smu,holes,pzero)
 INPUTS:
   bidref - The bi-directional reflectance.
   emu    - Cosine of the emission angle.
   smu    - Cosine of the incidence angle.
   holes  - Compaction parameter value (1981 formalism).
   pzero  - Value of the single particle phase function.
 OPTIONAL INPUT PARAMETERS:
   None.
 KEYWORD PARAMETERS:
   None.
 OUTPUTS:
   returns the single scattering albedo.
 COMMON BLOCKS:
   None.
 SIDE EFFECTS:
   None.
 RESTRICTIONS:
   This works on scalar input only.
 PROCEDURE:
 MODIFICATION HISTORY:
   Written 1995 Jan 13, by Marc W. Buie, Lowell Observatory