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Fig. D.1

image

Top: simulated SMGs added to a noise map to simulate our real 3 GHz VLA data. The S/N of the sources increases from left to right, top to bottom (S/N = 4–38), and in each row the PA ranges from to 135° in steps of 45° (being and 45° for the two bottommost objects). The synthesised beam size of is shown in the bottom left corner. Bottom: ratio of the measured to the simulated input source size (deconvolved FWHM) as a function of the S/N. The green points show the major axes ratio, while the red points show that between the minor axes. The minor axis FWHM for the faintest source (S/N = 4) could not be determined by the AIPS task JMFIT. The vertical error bars were propagated from the size errors determined by JMFIT. A one-sided error bar is shown for those cases where the minimum size could not be determined by JMFIT. The horizontal dashed line shows the line of equality between the sizes.

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