STUDY_VAR Primary study variation definition table, listing the variabl \rametersENTRY Entry or Record Number  I8 ENTRY STUDY_ID Fundamental study ID number  I5 Study TITLE_PTR Pointer into fundamental study database STUDY_TITLE I11 TITLE_PTR TITLE_ID  Fundamental study title ID number  I5 TtlID STUDYVAR  Study variation index  I4 SVar SV_DESC AStudy variation description A A65 Study variation N_RASTERS0 OFixed number of rasters in the study  I3 NR0 DURATION0 QFixed part of study duration F10.3 Dur0 DURATION1 UDuration/raster for variable part of study duration F10.3 Dur1 ZONE_ID YPointing zone ID  I4 Zone USABLE [Either Y or N, normally Y  A1 USABLE