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Table C.1

Parameters of the Gaussian toy model (night 1).

Parameter Symbol (unit) Prior Posterior
Na I D1 Na I D2
Mean (center of Gaussian) μ (Å) 5891.38 ± 0.01
width σ (Å) 0.14 ± 0.02 0.13 ± 0.01
Amplitude (in relative flux) A –0.012 ± 0.003 –0.032 ± 0.003
Offset a (in relative flux) ΔF 0.001 ± 0.000
Wavelength difference between D1 and D2 Δμ (Å) fixed 5.974

Notes. (a) The offset is the difference between the continuum level and null relative flux.

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