Phase function (i.e., Z₁₁-component of the scattering matrices) for the DIANA standard model in the wavelength λ = 0.8μm without the chopping mechanism and with chopping by 2°, using varying internal resolutions (n_ang) in optool. The bottom panel shows the same curves as the top panel, but with the y-axis linear and stretched so that the difference for larger scattering angles becomes visible. Except for the cut by 2° at the forward peak, the phase function is nearly the same for the case without chopping and high internal resolution (green line) and with chopping for the default internal resolution (blue solid line).