Three SPIRE beam sizes are shown overplotted on a SCUBA 450 μm archival image, 40.5′′ (blue), 17.5′′ (green), and 32.5′′ (red). The SPIRE beam size changes as a function of wavelength, thus the blue circle represents the largest beam size and the green represents the smallest beam size. The red beam size (32.5′′) represents the beam size of the CO J = 5 − 4 transition and all other lines are convolved to this beam size.