Thirty positions for the IRAM 30m single-pointing observations on the Herschel H ₂ column density map. This map is shown from 0 to 20% of the peak value (8.4 × 10²² cm⁻²). The 500 μm beam is 36.3′′. The 30 observation positions are along the main filament in the CMC. The 14 protostellar cores are plotted with red solid circles, the seven prestellar cores are plotted with green solid circles, the eight observation positions are reference positions that are offset from the cores plotted with blue solid circles, and one position is projected on galaxy 3C111, plotted withpink solid circle.