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Table 2.
Number of parameters optimised when forward-modelling the lenses.
| Parameter | Count | Case of Fig. 3 |
|---|---|---|
| Astrometry | 2Ns | 8 |
| Translations | 2Ne | 1720 |
| Point source fluxes | Ns ⋅ Ne | 3440 |
| Mean background | Ne | 860 |
| Pixelated background | (S ⋅ Nx)2 | 5776 |
Notes. Ns is the number of point sources, Ne the number of frames, Nx the number of pixels in a side the (square) data cutouts, and S the supersampling factor. In the example of Fig. 3, we have Ns = 4, Ne = 860, Nx = 38, and S = 2.
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