Grid of HCO+(1−0) spectra obtained from RATRAN modelling of a collapsing cloud (see text). All input parameters are fixed with the exception of the infall velocity (Vinf) and velocity dispersion (σturb). Each modelled spectrum (in red) has been obtained for the corresponding Vinf − σturb displayed in the top and right-hand sides of the figure. The numbers in the top right-hand corner of each spectrum give a relative idea of the fit quality. The HCO+(1−0) spectrum observed at the centre of SDC335 is plotted in black. Since we aimed to keep the observed spectra displayed in scale, we applied a 0.5 factor to the modelled spectra to take into account the Mopra main-beam efficiency.
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