Transits of sources fainter than G = 13 are one-dimensional with the assigned window divided into different samples in the AL direction with each sample spanning the full length of the window in AC. We illustrate, above and below the acquisition window (left panel), the approximate shape of the LSF provided through these one-dimensional samples. If a near neighbour aligns with the source in the AC direction this can cause an enhancement in the flux recorded for the source without disturbing the goodness-of-fit statistics of the transit in question. This sketch shows the impact of this arrangement on the lightcurve of the source; how the rectangularly shaped windows can capture flux from neighbouring sources in preferential directions, and hence how this may generate a spurious alert.