& xx_obcsnstartdate1, xx_obcsnstartdate2, xx_obcsnperiod,
& , xx_obcsnperiod
_RL xx_obcsnperiod
I xx_obcsnstartdate, xx_obcsnperiod,
fldperiod = xx_obcsnperiod
startrec = int((modelstart - diffsecs)/xx_obcsnperiod) + 1
endrec = int((modelend - diffsecs)/xx_obcsnperiod) + 2
xx_obcsnperiod = 0. _d 0