Maps of the continuum emission at 218 GHz from the six targets observed. The solid contours correspond to the 5σ levels. The ellipse in the bottom right corner of each panel denotes the half-power width of the synthesized beam. The maps cover the whole region where emission is detected. The labels indicate the UC Hii region in G29.96 and the cores that we will refer to in the present study. The maximum recoverable scale in these images is ~4′′, much greater than the diameter of the largest cores detected.