    INTEGER
          The leading dimension of array D.
          LDD &gt;= MAX(1,P), if JOBD = 'D' or JOBD = 'F';
          LDD &gt;= 1,        if JOBD = 'Z'.

  NR      (output) INTEGER
          If CKPROP = 'C', DICO = 'C', and JOBE &lt;&gt; 'I', the order of
          the reduced system. Otherwise, NR = N.

  GPEAK   (output) DOUBLE PRECISION array, dimension (2)
          The L-infinity norm of the system, i.e., the peak gain
          of the frequency response (as measured by the largest
          sin