of the iterative algorithm. If no
          estimate is available, set FPEAK(1) = 0, and FPEAK(2) = 1.
          FPEAK(1) &gt;= 0, FPEAK(2) &gt;= 0.
          On exit, if INFO = 0, this array contains the frequency
          OMEGA, where the gain of the frequency response achieves
          its peak value GPEAK, i.e.,

              || G ( j*OMEGA ) || = GPEAK ,  if DICO = 'C', or

                      j*OMEGA
              || G ( e       ) || = GPEAK ,  if DICO = 'D',

          where OMEGA = FPEAK(1), if