Composite 3-colour image of Vela-C: PACS 70 μm (blue), PACS 160 μm (green), and SPIRE 500 μm (red). The blueish regions near the centre and towards the bottom right of the map are the HII regions RCW 36 and RCW 34, respectively. Red and blue diamonds represent the locations of prestellar and protostellar sources, respectively, belonging to the sample of 268 objects used for the SED analyisis. Bigger diamonds indicate sources with M ≥ 20   M_⊙, while yellow diamonds indicate a few sources inside RCW 34 (see text). The top left segment corresponds to a length of 5 pc in the sky for a distance to Vela-C of 700 pc.