CoG V: Astrometry and Radial Velocity sample selection functions in Gaia EDR3

Selection functions for three Gaia science samples estimating the probability that a source in Gaia EDR3 will have i) a reported parallax and proper motion (\"astrometry\") ii) an astrometric renormalised unit weight error below 1.4 (\"ruwe1p4\") iii) a reported radial velocity (\"rvs\"). These selection functions are estimated as a function of G-band apparent magnitude and position on the sky, with the latter two also being dependent on G-Grp colour.