Top panel: a histogram of the wavelength Δλ positions of the NLTE Stokes V amplitude of the Si i 10 827 Å line. Arrows and numbers indicate the mean wavelength position of this amplitude in the left and right wings of the line. Bottom panel: histograms of the NLTE heights of formation HΔλ(NLTE) calculated for three wavelengths within the Si i 10 827 Å line intensity profile. The mean heights of formation ⟨ H ⟩ are shown near each of the histograms. Values of HΔλ(NLTE) represent the heights, where the NLTE optical depth at a given line wavelength Δλ is equal to unity: τΔλ(NLTE) = 1. The histograms have been calculated using the 3D snapshot with ⟨ | BZ | ⟩ = 80 G and the simplest Si i model with six bb transitions (see the left bottom panel of Fig. 4). The top horizontal axis gives the mean optical depths log 10 ⟨ τ5 ⟩ corresponding to the heights shown in the bottom horizontal axis. The scaling factor SH = 0.1.
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