CALIFA cubes can be cut out along RA, DEC, and spectral axes. CIRCLE and POLYGON cutouts yield bounding boxes. Also note that the coverage of CALIFA cubes is hexagonal in space. This explains the empty area when cutting out CIRCLE = 225.5202 1.8486 0.001 BAND = 366e-9 370e-9 on ivo://org.gavo.dc/~?califa/datadr3/V1200/UGC9661.V1200.rscube.fits.