Fig. B.1

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Emergent I and Q/I proflies at µ = 0.1 as a function of wavelength (top row) for the Sr I 4607 Å (first and second columns) and Ca I 4227 Å (third and fourth columns) lines (in the absence of magnetic fields), modeled considering Nz = 41 and all 12 combinations of 3 formal solvers, namely DELO-linear (red), DELOPAR (green), and DELOPARABOLIC (blue), and 4 optical depth conversion schemes, namely trapezoidal (dot-dashed), parabolic (dot-dot-dashed), spline (dotted), and cubic Hermite (dashed). The reference solution (black solid line) is obtained with the cubic Hermite conversion, the DELO-parabolic formal solver, and Nz = 2561. The bottom row shows the corresponding relative errors as a function of wavelength.
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