H₂CO spectra of the main sources in each (proto)cluster of IRAS 19410+2336. In the upper row are the H₂CO(3_2,2−2_2,1) spectra for sources 4-n (left panel) and 13-s (right panel), and similarly in the bottom row are the H₂CO(3_0,3−2_0,2) spectra for those two sources. A Gaussian profile was fit to each spectrum, and is shown by a green solid line. The dotted line marks the rest velocity adopted for the observations.