The MCMC posterior distributions of λ and vsinI for WASP-22 when a) a Gaussian prior of 4.5 ± 0.4 km s^-1 is imposed on vsinI and b) no prior is imposed on vsinI. Note that, though the abscissa ranges of each graph are equal, the ordinate ranges are not. The white, blue and black contours are, respectively, the 1-, 2- and 3-σ confidence limits. The shading of each bin is proportional to the logarithm of the number of MCMC steps within. Aligned spin-orbit axes would have λ = 0°, which is marked by the dotted, brown line.