Comparison of the method by Everall & Boubert (2022, left column) and the one developed in this paper (right column). The top panels show the Gaia EDR3 selection function for stars with RVs at G = 12 mag, while the bottom panels show the same selection function at G = 13 mag. The results from the two methodologies show good general agreement, capturing similar features in the sky maps, with the method developed by Everall & Boubert (2022) being a smooth version of the maps due to the inclusion of smoothing and correlation coefficients between different bins. All the maps correspond to a resolution of HEALPix level 5.