Impact of the numerical conversion to optical depth on the transfer of polarized radiation

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Table 1

Convergence rates of optical depth conversion schemes.

Conversion scheme	Continuum	Sr Ib 4607	Ca I 4227
Trapezoidal	2.04 ± 0.01	2.04 ± 0.01	2.04 ± 0.01
Parabolic	3.12 ± 0.02	3.11 ± 0.02	3.10 ± 0.02
Spline	3.80 ± 0.07	3.98 ± 0.01	3.98 ± 0.01
Cubic Hermite	4.01 ± 0.01	4.01 ± 0.01	3.87 ± 0.08

Notes. Convergence rate, k_τ, with uncertainties of the trapezoidal, parabolic, spline, and cubic Hermite optical depth conversion schemes, considering the continuum, Sr I 4607, and Ca I 4227 settings.

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