Multi-wavelength views of NGC 5457 or M101. Left: False-colour RGB composite of M101 using H I (THINGS, red), Hα (SITELLE, green), and FUV (GALEX, blue). The colour mapping is subtractive rather than additive, highlighting variations in neutral gas phase (H I), recently star-forming regions (Hα), and older star formation (FUV). Right: False-colour RGB composite of M101 using SITELLE’s SN1, SN2, and SN3 filters. The mosaic combines four pointings (each covering 11′×11′) to capture the full extent of the galaxy.