Median stacked pixel values of the RMS noise images of all ten pointings. As primary beam correction is applied, the noise goes up towards the edges of the image. Since a strong central source is always present, the noise is always higher in the centre as well. The given contours from white to black are 20, 40, and 60% RMS noise coverage. The stacked beam (50 time increase in size) of all the pointings is shown in the lower-left corner, matching the elongated structure in the centre.