dayiter = hoursperday*(irec-1)+modeliter0
& hoursperday,
integer hoursperday
hoursperday = 24
dayiter = hoursperday*(irec-1)
& ( ersintercept + ersslope*irec*hoursperday ) )
& ( gfointercept + gfoslope*irec*hoursperday ) )
& ( topexintercept + topexslope*irec*hoursperday ) )
& ( sla_intercept + sla_slope*irec*hoursperday ) )