Joint cosmic shear and shear–tSZ data covariance. Upper right: contribution of the super sample covariance (SSC) to the joint covariance. Shown is the ratio between the absolute value of the SSC contribution and the absolute value of the total covariance in Eq. (8). The ratio can exceed unity, since different contributions to total covariance can cancel one another out to a certain degree. Lower left: correlation coefficients corresponding to the data covariance matrix.