N(H₂) maps towards each core in the sample (labelled in the top left corner of every panel). The scale bar shown in the bottom right corner represents a length of 0.05 pc. The white contours show the 20, 40, and 60% levels of the peak value within the central Herschel beam. The solid circles show the APEX pointing and the N(H₂) map beam size, whilst the dashed circles show the beam sizes and pointings of APEX for the oH₂D⁺ line. Note the small shift present between the two positions for Oph D, where the oH₂D⁺ beam is not the central LAsMA beam, but one of the external ones (see main text). The shift is, however, smaller than the continuum and APEX resolutions.