ALMA 1.4 mm continuum emission toward the nine MDCs. The blue ellipses show the MDCs as defined by Tigé et al. (2017). The compact sources extracted by Getsources in the MDCs #16, #26, and #45 (see text and Table 2 for details) are indicated with small black ellipses and red labels. The blue and red contours highlight the ALMA ¹²CO(2–1) integrated emission in the blueshifted and redshifted channels, respectively. The contours start at 3σ with a 3σ step in each panel. The values for the integration in velocities and the resulting rms is given in Table A.2. Bottom right panel: black contours (MDC #16) show the column density emission derived from Herschel observations (Tigé et al. 2017). The contours range from 50 to 90% by step of 10% of the peak flux in the MDC #16 (blue ellipse). They show that the continuum sources ALMA#1 and #2 are associated with the MDC #16.