Dependence of and time averaged between t = t^sat to t = t^sat + t_A0 on the test-field wavenumber k′ in the midplane of the magnetic layer (z = z_B) and near the midplane of the box (z = 0.21L_z) for run TF30+ of Table 3. Thick lines in panel for : turbulent pumping coefficient . Rescaling of to the molecular value η by the factor U_rmsH_B/η = 21.5. Integer and half-integer values of k′ belong to sine and cosine modes in , respectively. Note that k′ = 0 refers to constant and linear test fields and that the corresponding coefficients do not enter the – relation for the given setup.