Histograms of f, α, v0, and σ (with ) obtained when fitting the along-scan (top) or across-scan (bottom) LSF model (Eq. (7)) to the 448 LSFs resulting from combining 14 SM CCDs, 16 stellar spectral-energy distributions, and two values of interstellar extinction (see Fig. 4). The normalisation constant A has been frozen to unity in all fits. The across-scan direction refers to average across-scan motion. Since the Gaia pixel ratio (10 × 30 μm2, i.e., 1:3) effectively cancels the Gaia aperture ratio (1.45 × 0.50 m2, i.e., 3:1), the along- and across-scan LSFs have roughly the same size (σ ~ 1 pixel).
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