9.3.3 Treatment of Sky Mapper windows

SM windows are 2D windows. The first step consists in binning the AC samples into one sample to get a 1D window with increased signal to noise. The 1D SM windows are then re-sampled using similar cubic spline interpolation as for the AF windows so that a ‘synthetic SM’ window is produced, constituted of (240 pixels AL $\times$ 1 pixel AC) with a pixel size$=$(19.6 mas $\times$ 2121 mas) for $G$ $>$ 13 mag.

The SM re-sampled synthetic windows of each transit are then re-centred according to LPC values. The LPC and the maximum flux pixel position are compared as for AF windows and when the difference is $>160$ mas for quasars and galaxies (typical RMS of the differences over SM windows of all sources) the window is eliminated.

Each synthetic SM window is then re-binned into a 20 samples window corresponding to SM original dimensions. Considering the re-binned SM windows of all transits on a source, an iterative sigma clipping on individual samples of the window (following the same rules as for median AF windows) is applied.