W43-MM2&MM3 protocluster cloud. Panel a: 1.3 mm image obtained by the ALMA 12 m array (best-sensitivity image, prior to primary-beam correction). W43-MM2 is to the west and W43-MM3 is to the east. White ellipses outline the FWHM size of compact cores extracted by getsf. Panel b: three-color ALMA image. Red and green display the bsens continuum images at 1.3 mm and 3 mm, respectively, scaled by the theoretical ratio of thermal dust emission (see Eq. (3)). Blue corresponds to the free-free continuum emission image at the frequency of the H41α recombination line (Galván-Madrid et al., in prep.). Filaments and cores appear in orange (red + green), tracing thermal dust emission; the UCH ii region appears in blue or cyan (blue + green), indicating free-free emission. Ellipses in the lower left corners represent the angular resolution of the bsens 1.3 mm image and scale bars indicate the size in physical units.