ALMA fields and the clusters Tr 16 and Tr 14 shown on a wide-field optical image of the Carina nebula (ESO). Red circles mark upper and lower limits to the size of irradiation zones around each cluster (see Section 4). The ALMA fields are represented by the close-up images observed with the Hubble Space Telescope and its Advanced Camera for Surveys instrument in the F658N narrow-band filter. Within the Tr 14 region, the circles contain proplyd candidates, whereas the squares mark sources with near-infrared excess.