Percentage of matches based on the propagated covariance for Saturn, considering r = 400, 500, 600, 650, 700, 750, and 800 AU and M_P9 = 5 and 10 M_⊕. The x-axis represents the RA of P9 when the y-axis is its Dec. The z-axis gives the matches (see Sect. 4.1 for a defintion) in percent between the INPOP19a propagated covariance of the Saturn orbit over the time coverage of the data and the Saturn-orbit-propagated covariance of the ephemerides including perturbations by P9.