Final reduced second epoch composite image of a wider field around Fomalhaut, at both 3.6 μm (left) and 4.5 μm (right). As for the case of ϵ Eri, all point sources in the image have detectable signatures in both channels, consistent with background stars. The point source marked with an arrow has a strange morphology at 3.6 μm, possibly due to it coinciding with a residual spider feature. In the outer ranges of the image where PCA-based subtraction has not been applied, the imperfect background removal from a simple median subtraction leads to an asymmetric background distribution between the upper right and lower left sections of the image.