double obs_provenance(datum) ;
                obs_provenance:Ship_Code_Endeavor = 10. ;
                obs_provenance:Ship_Code_Knorr    = 20. ;
                obs_provenance:Ship_Code_Oceanus  = 30. ;
                obs_provenance:Ship_Code_Quest    = 40. ;
                obs_provenance:Ship_Code_Tioga    = 50. ;
                obs_provenance:Ship_Code_Hatteras = 60. ;
		obs_provenance:Ship_Code_Oleander = 70. ;
                obs_provenance:Glider_Code_RU01   = 110. ;
                obs_provenance:Glider_Code_RU05   = 120. ;
                obs_provenance:Glider_Code_RU06   = 130. ;
                obs_provenance:Glider_Code_RU07   = 140. ;
                obs_provenance:Glider_Code_RU09   = 150. ;
                obs_provenance:Glider_Code_RU10   = 160. ;
                obs_provenance:Glider_Code_RU11   = 170. ;
                obs_provenance:Glider_Code_Jane   = 190. ;
                obs_provenance:AVHRR_SST          = 300. ;
                obs_provenance:AVISO_SSH          = 400. ;
                obs_provenance:Jason-1            = 401. ;
		obs_provenance:Envisat_SSH        = 402. ;
		obs_provenance:Codar              = 500. ;
		obs_provenance:Mooring            = 600. ;
                obs_provenance:CTD                = +0 ;
                obs_provenance:XBT                = +1 ;
                obs_provenance:Thermosalinograph  = +2 ;
                obs_provenance:Scanfish           = +3 ;
                obs_provenance:ADCP               = +4 ;
                obs_provenance:OTS                = +5 ;
                obs_provenance:Drifter            = +6 ;
                obs_provenance:ATHENA             = +7 ;
                obs_provenance:ECOshuttle         = +8 ;
		obs_provenance:Thermistor         = +9 ;