 reference frame. If this is not the case, the numerical
      result has no meaning.

   the call:

      vproj = <b>cspice_vproj</b>( a, b )

   returns:

      vproj   vector containing the projection(s) of 'a' onto 'b' ('vproj' is
              necessarily parallel to 'b'.)  If 'b' equals the zero vector
              then the zero vector will return as 'vproj'.

              [3,n] = size(vproj); double = class(vproj)

             'vproj' returns with the same vectorization measure, N, as
            