For the linear (left) and nonlinear (right) matter power spectrum of the fiducial model at redshift z = 0 (top) and z = 2 (bottom), percentage difference between the predictions of CLASS and CAMB. Here, the reference is the CLASS high-precision (HP) result. We compare it with CLASS Default Precision (DP) and CAMB with the precision settings defined as P1, P2, P3 in the text. 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.