Block-normalised covariance matrices S_N for the highest-f_sv light curve regression models obtained for KIC003240411, KIC003459297, KIC003756031, KIC003839930, KIC003865742, and KIC004930889. The strategies that correspond to these highest-f_sv light curve regression models are listed in the ‘Strategy’ columns in Tables 2 and 3. The normalisation values for each block are displayed at the locations specified in Fig. A.1. We note that the (one-cell-wide) blocks of (co)variances with the y intercept β₀ are displayed at the bottom and right hand side of each panel. The change in darkness between the upper and lower triangular part of each matrix is aesthetic.