Parameter correlations for Plik TT+lowTEB, including some ΛCDM extensions. The leftmost column is identical to Fig. 44 and is repeated here to ease comparison. Including extensions to the ΛCDM model changes the correlations between the cosmological parameters, sometimes dramatically, as can be seen in the case of A_L. There is no correlation between the cosmological parameters (including the extensions) and the dust amplitude parameters. In most cases, the extensions are correlated with the remaining foreground parameters (and in particular with the point-source amplitudes at 100 and 143 GHz, and with the level of CIB fluctuations) with a strength similar to those of the other cosmological parameters (i.e., less than 30%). Y_He exhibits a stronger sensitivity to the point-source levels.