Comparison of the prior on EOS parameters, transformed to the space of mass and radius, as it would be updated after performing parameter estimation on GW170817 with (green contours) and without (blue contours) fixing the chirp mass to the median, M_chirp = 1.186 M_⊙, of its marginal posterior distribution. The two distributions show some small-scale differences in the 1σ contour but are globally consistent. For comparison we also show the prior distribution before including information from GW170817, but with the 2.14 M_⊙ pulsar information, in black contours. For all contours the dotted and dashed lines indicate the 68% and 95% credible regions, respectively.