Plots showing GP predictive means fit by 2D GP in 600B dataset to account for (in order from left to right): (a) common-mode systematics, (b) high-frequency systematics and (c) wavelength-specific systematics. The rightmost plot is the raw light curves included for reference. Specifically, the middle plots show the change in the GP mean caused by including these systematics in the fit, as discussed in Sec. 4.2.