s (AV,BV,CV,DV)
  and (AW,BW,CW,DW) are minimal. In case of possible pole-zero
  cancellations in forming V*G and/or G*W, the parameters for the
  choice of frequency-weighted Grammians ALPHAO and/or ALPHAC,
  respectively, must be different from 1.

</PRE>
<A name="Specification"><B><FONT SIZE="+1">Specification</FONT></B></A>
<PRE>
      SUBROUTINE AB09IY( DICO, JOBC, JOBO, WEIGHT, N, M, P, NV, PV,
     $                   NW, MW, ALPHAC, ALPHAO, A, LDA, B, LDB, C, LDC,
     $                   AV, LDAV, 