Cross-power spectra between WiggleZ galaxies and MeerKAT H I intensity maps cleaned by mPCA at redshift z ≈ 0.4. We keep the number of modes removed at small scale fixed at N_S = 4 (top panel) and N_S = 8 (bottom), and we remove different numbers of large-scale modes (from dark, N_L = 4, to light colour lines, N_L = 9), with 1σ error bars (corresponding shaded areas). The red dashed line is the fitted model from CL23 (same data, different cleaning strategy) that instead includes a 𝒯 correction for the signal loss; as a rule-of-thumb, the uncorrected CL23 best-fit would show an 80% lower amplitude at the largest scale probed (e.g. below the 1σ boundary of the N_L = 4, measurements for k ≲ 0.14 h/Mpc). We plot the product kP(k) to accentuate the small scales that would otherwise be flattened by the much higher low-k measurements.