NAME: spd_ui_req_slp PURPOSE: Determines availablity of solar/lunar ephemeris data. CALLING SEQUENCE: General: bool = spd_ui_req_spin(inCoord,outCoord,trange,loadedData) Example: if spd_ui_req_spin(inCoord,outCoord,trange,loadedData) then begin thm_load_slp,datatype='all',trange=trange endif INPUT: inCoord: string storing the destination coordinate system (e.g. 'gse') outCoord: string storing the destination coordinate system (e.g. 'sse') trange: two element arraw storing the time range loadedData: gui loadedData object reference OUTPUT: Returns boolean: 1 if required data is not present or does not cover the time range, 0 otherwise. NOTES: This code assumes that only explicit transformations into the coordinates in question will require slp data.