Correlation diagrams illustrating the probability distributions resulting from the simultaneous modelling of the light and radial velocity curves of YY Dra using XRBCURVE. Only the most relevant parameters are shown. The 68, 95 and 99.7 per cent confidence contours are indicated in the 2D plots. In the right panels, the projected 1D parameter distributions are presented, with dashed lines indicating the mean and 68 per cent confidence level intervals.