Growth curve of the CO(2–1) moment 0 map for 00188−0856 as an example. The circles correspond to the observed flux within a circular aperture of radius r. The red line is the best fit model (Sect. 4.3). The deconvolved best fit profile is shown in blue and its effective radius, r_CO = FWHM/2, is indicated by the vertical blue dotted line. The dashsed green line marks the ∼220 GHz continuum radius, r_cont for comparison. The CO(2–1) model fits for the whole sample are shown in Fig. C.1.