l($W576
  DISPLAY
  This is as for case 576, with the addition of a stream of
  different composition entering above the step
  ENDDIS
TEXT(W576 with extra cold light-phase inflow :W700
TITLE
PATCH(INFLOW,NORTH,1,NX/4,NY,NY,1,1,1,1)
COVAL(INFLOW,P1,FIXFLU,RHO1*UIN);COVAL(INFLOW,V1,ONLYMS,-UIN)
COVAL(INFLOW,H1,ONLYMS,0.0)