Diagonal figures show in black the uncertainty level for in units of K_CMB cts s^-1 armin^-2 sr for the cleaned power spectra between the RASS map in the 0.5−2.0 keV energy range and the Planck maps at 70, 100, 143, 353, and 545 GHz, using a binning of Δℓ = 40, In red we show the tSZ-Xray cross-power spectrum for the model. The off diagonal figures show the correlation factor ρ between at frequencies ν and ν′. See Sect. 5.1 for details on computing uncertainties and their covariance.