as follows:
          = 'U':  the upper triangular parts of R and T are given;
          = 'L':  the lower triangular parts of R and T are given;

  TRANS   CHARACTER*1
          Specifies the form of op( M ) to be used, as follows:
          = 'N':  op( M ) = M;
          = 'T':  op( M ) = M';
          = 'C':  op( M ) = M'.

  HESS    CHARACTER*1
          Specifies the form of the matrix A, as follows:
          = 'F':  matrix A is full;
          = 'H':  matrix A is Hessenberg (or Schur), either upper
 