Corresponding to the models in Fig. 7, the accuracy of the recovered peak column densities (left frames) and FWHM values (right frames). The relative errors of method B (cyan and magenta crosses for cold and warm sources, respectively) and method E (blue and red plus signs for cold and warm sources, respectively) are shown relative to idealised observations at 18.3″ resolution. The noise levels kn are indicated in the frames. Values with relative errors outside the range of [–0.6, 0.6] are plotted at those boundaries. To reduce overlap between plot symbols, some jitter was added to the x-coordinate values of the FWHM plots.
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