LOS velocities of clumps in the Lagoon Nebula. Upper panel: positions of the individual clumps (circles), with the grey-scale image showing the JCMT SCUBA 870 µm dust continuum flux (see Fig. 2). The circle size corresponds to the beam size of the on-off observations with APEX and the IRAM 30m telescope. Bi-coloured circles visualise distinct velocity components observed in the same beam. Lower panel: LOS velocity of the M8 clumps as a function of RA separation from the cloud centre at RA=18^h04^m 06^s. Multiple velocity components inside one beam are shown as individual points.