Demonstration of the impact of free-free subtraction, carried out by Galván-Madrid et al. (in prep.), on the PPMAP-derived column density (top panel) and luminosity (bottom panel) maps of G012.80. The left panel displays the map obtained from the subtracted data (Run1), while the right panel depicts the outcomes achieved with the standard ALMA data (Run2). Superimposed white contours illustrate the H41α line emission, that traces regions dominated by free-free emission (contour levels: logarithmically spaced between 0.045 to 0.5 Jy beam⁻¹). Arrows indicate the positions of the main HII regions.