Curves of (log(ℒ) − max(log(ℒ))) corresponding to 1D likelihood scans through the parameter space for the mock data set with a single cloud along the LOS. For each scan only the explored parameter varies, while all other parameters are kept fixed to their true values. The log-likelihood (log(ℒ)) is estimated at each point. The horizontal solid and dashed lines show the values of 0 and −1, respectively, providing an approximate estimate of the location of the 68 per cent credible interval. In the top (bottom) row the vertical axis ranges from −40 to 5 (−7.5 to 0.3). The red vertical line on each panel indicates the so-called true value reported in Table 1.