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Fig. 4

image

Ratio of measured true flux densities (gray dots) as a function of local azimuth of the source position in the first pointing, for a selection of bright, compact sources that are found in overlap areas between neighboring pointings in a Dec range close to –45°. Top: with no pointing correction, there is a systematic deviation from unity (thin black line). The median trend of binned flux ratios (solid line; dashed lines represent the one sigma scatter) is sinusoidal with a peak at a local azimuth of 180°, which indicates an average negative pointing offset along the Dec axis (which is fit for). Bottom: when using the pointing offset model (see Fig. 5) on the same sources, this systematic deviation is strongly suppressed.

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