Derivative of the logarithm of the linear (left) and nonlinear (right) matter power spectrum with respect to each cosmological parameter in our basis, computed with CLASS (with either DP or HP) and CAMB (with either P1, P2, or P3 precision). The derivatives are computed at z = 0. In the linear case (left), the CAMB P1 curve is always overdrawn by the P2 one, since the difference between P1 and P2 is only relevant at the level of the nonlinear spectrum. Moreover, P2 is always nearly overdrawn by P3.