Example of the spectral extraction, in this case for Arp 299 A, at different spatial scales. Left: integrated intensity map of the SL1 cube (7.46–14.29 μm) overlaid with circular apertures of radii 2.5, 4.5, 6.5, and 8.5″, shown as the dashed lines. Right: extracted spectra from the apertures in the left panel with the corresponding colour. The innermost spectrum (purple) has had an aperture correction applied.