Left: best-fit solution of the celerite modelling (orange solid line) with the 1σ shaded contours for the light curve of NGC 5204 X–1. The model shows the SHO with additional white noise (model b), for which we only show the oscillatory component. Right: posterior probability distributions of the parameters of the celerite model. The histograms along the diagonal show the marginalised posterior distribution for each parameter with dashed lines indicating the median and the 1σ errors. The two-dimensional histograms show the marginalised regions for each pair of parameters with the contours showing the 1 and 2σ confidence intervals.