Top panel: integrated G-band intensity histograms, F_BT, of strong-field pixels with B ≥ 1300 G (see main text for definition). The mean quiet-Sun intensity is indicated by the vertical line. Bottom panel: variation of F_BT(I_QS) with B_T, where I_QS is the mean quiet-Sun intensity and B_T is the magnetic field threshold. F_BT(I_QS) gives the fraction of all pixels with a field strength greater than B_T, which also have an intensity greater than I_QS. The vertical line indicates the lowest B_T value at optical depth unity that corresponds to a kilogauss field at the height of average line formation of Fe i 525.02 nm. The black, red, and green lines refer to the snapshots taken from the 30 G, 200 G, and 400 G simulations.