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  If the user wishes to supply constants for a spheroid other than those in Table 3, a negative spheroid code must be used, and the semimajor axis and semiminor axis or eccentricity squared must be supplied in the input and output projection constants. 
  The values of the semimajor axis, semiminor axis, the radius of the sphere, the height of the perspective center, the false easting, and the false northing must be expressed in meters. 
  axis or radius of the sphere + 
 geography.usgs.gov /ftp/software/current_software/gctp/l176um.txt (1809 words) 
