Zoom-in of a region of interest in the M33 field, focusing on two H II regions. In the left classification map, we quantitatively represent the predicted contribution to each pixel’s spectra from an H II region in green, a PN in blue, and a SNR/DIG in red. We overlay a S/N map (in shades of grey), derived from the Hα flux map and its associated error map. The right panel shows a [S II]λ6716, 6731/[O III]λ5007 ratio map. The black, purple, and magenta contours in this panel enclose a model-predicted H II region probability of 0.4, 0.6, and 0.9, respectively.