ict(31) = 0            no checkpoint restart in compar link
ict(31) = negative,    checkpoint restart in compar at start of
observation library tape
ict(31) = positive,    checkpoint restart in compar in middle of
observation library tape
in either of the above two cases, jtape counter in compar is set
to iabs(ict(31))
ict(32) = value of ntape for compar checkpoint restart
ict(33) = value of nseq for compar checkpoint restart
if ict(33).gt.0
ict(33) = value of nseq for series before compar checkpoint
restart if ict(33).lt.0
iobs = observation card data set (sysin if 5, in which case it is
assumed that the person restarting compar has the obser-
vation cards beginning at the restart point)
iabs1= input observation library tape
iabs2= output observation library tape