ACTER*1
          Specifies whether the user wishes to preliminarily
          equilibrate the system (A,E,B,C) or (A,B,C), as follows:
          = 'S':  perform equilibration (scaling);
          = 'N':  do not perform equilibration.

  JOBD    CHARACTER*1
          Specifies whether or not a non-zero matrix D appears in
          the given state space model:
          = 'D':  D is present;
          = 'Z':  D is assumed a zero matrix;
          = 'F':  D is known to be well-conditioned (hence, to have
   