Summary statistics of the calibration procedure in BAM based on one SLICS realisation. Panel (a): Residuals computed from the reference power spectrum and the halo power spectrum at different iterations within the calibration procedure. Absolute residuals (see Eq. (13)) show that the calibration leads to a precise (< 1%) reconstruction of the halo number counts and its two-point statistics, while relative values show that the deviation around the reference is randomly distributed, with a ∼0.15% amplitude. The different lines in each case show the behaviour under different models (TkWEB, IkWEB, TIWEB) of halo bias (see Sect. 2.6 for details). Panel (b) shows the power spectrum from the reconstructed halo number counts field in each of the halo models. Panel (c) shows the transfer function 𝒯_i(k) computed as in Eq. (11), evaluated at the last iteration of the calibration procedure; the shaded area denotes the 3% deviation around unity. Panel (d) shows the BAM kernel computed using Eq. (12).