Z-scores of retrieved atmospheric features from Simulation 2, which had short wavelength length scale correlated noise. The three methods tested were fitting the light curves with 1D GPs (top row), the Hybrid method (middle row) and a 2D GP (bottom row). All methods have mean Z-scores consistent with zero, that is none of them biases the results towards measuring larger or smaller values of the features. The retrieved variance of Z-scores for the 2D GP method are all consistent with a variance of one (matching the Gaussian distribution plotted in red), but not for the other methods, which indicates overestimation or underestimation of uncertainties.