Estimated core mass versus the mean temperature of the core. The hollow circles indicate starless cores, while the filled circles indicate prestellar cores. The colours indicate the regions as given by Fig. 5. The open circles represent cores that were classified as unbound starless cores. The robust prestellar cores are indicated by circles filled using the same colour as their respective subregion. Candidate prestellar cores are filled in grey, with an outer circle colour-coded to their respective subregion (see Fig. 5), or black for cores with no assigned subregion.