Evolution of the relative scaling parameters $\left(\overline{\alpha }-{\alpha }_i\right)/\overline{\alpha }$ with respect to the dataset considered. α_i is the scaling parameter for the i-th observation, while $\overline{\alpha }$ is the mean of α_i taken over all i. $\overline{\alpha }$ values for each model are reported in the legend. Only datasets with continuum information were rescaled. Each color represents one of the model tested: blue for Exo-REM, green for ATMO, red for BT-Settl, and orange for Sonora. The error bars correspond to the lower and upper bonds in the parameter space encompassing 68% of the retrieved solutions around the best fit.