endrec = int((modelend + startTime - diffsecs + modelstep/2)/
endrec = int((modelend - diffsecs)/xx_obcsnperiod) + 2
endrec = int((modelend - diffsecs)/xx_obcssperiod) + 2
endrec = int((modelend - diffsecs)/xx_obcswperiod) + 2
endrec = int((modelend - diffsecs)/xx_obcseperiod) + 2