“Leave-one-out” cross-validation to test performance of accuracy of the GPRE, which is used in Sect. 7 to investigate the performance of the DSS with the two different filters on a continuous two-dimensional projected parameter space. On the y-axis the relative difference between the predicted shear profile of one cosmology if the emulator is trained exclusively by the remaining cosmologies and the corresponding shear profile which the emulator tries to emulate. The black lines here are correspond to the fiducial case. The quantiles N₄ and N₃ are quite inaccurate, but the other quantiles are of the 10% level accurate, which are indicated with horizontal grey lines.