Angular clustering correlation functions w(ϑ) measured in FLASK fields after they have been depleted (as described in Sect. 5.2; Eq. (5.3)) according to the output of various SOMs trained against the KiDS-1000 bright sample (KiDS-Bright). For each configuration, panel titles give the bias:SOM trained against KiDS-Bright, and the recovery:SOM trained against biased FLASK data to create organised randoms. Top: ratios of measured clustering signals to the true, unbiased clustering. Bottom: unbiased angular clustering signature (black points and dashed curves; measured with uniform randoms on unbiased FLASK fields), compared with biased (grey triangles and hatching; measured with uniform randoms) and recovered (coloured points and shading; measured with organised randoms) clustering signals measured in the depleted fields. Errors are the root-diagonal of the covariance over 30 FLASK realisations, and all are given to ±1σ. From left to right, the FLASK fields are biased according to δ_OR from the 800C, 800C, 100C, 100C, and 100C SOMs, trained against KiDS-Bright. The m-parameter (Eq. (5.3)) is set to unity in all but the purple panel (where m = 4). Each correlation measured in the depleted fields using organised randoms displays improved consistency with the unbiased signal, compared to the signals measured using uniform randoms.