⟨B_LOS⟩(μ) retrieved from the λ₀ = 6173.3 Å line at the five tested resolutions. From the top left panel clockwise: results for simulations with ⟨B_Z⟩ = 30, 50, 100, 200 G respectively. At each μ the retrieved ⟨B_LOS⟩ quantities are averaged over all snapshots and the two employed viewing directions. The shaded regions denote the standard deviation over the range of snapshots. The legend in the upper left panel is valid for all panels. The dashed black lines indicate the expected μ-dependence under the assumption that the ‘ground truth’ ⟨B_Z⟩ is retrieved at μ = 1.