function mvn_sep_get_bmap,mapnum,sensor
common mvn_sep_get_bmap_com, lut,bmap,last_mapnum,last_sensor
if (n_elements(last_mapnum) eq 0) || (mapnum ne last_mapnum) || (sensor ne last_sensor) then begin
lut = mvn_sep_create_lut(mapname,mapnum=mapnum)
bmap = mvn_sep_lut2map(lut=lut, sensor=sensor)
last_mapnum = mapnum
last_sensor = sensor
endif
return,bmap
end