Fig. 4

Modeling of the squared visibility data (in black) with R52 (red) and o54 (blue) CODEX models. Our division in 6 spectral bands is indicated as well as the molecular absorption bands from Lançon & Wood (2000). Each panel shows three visibility spectra corresponding to the three baselines of one triplet: D0-H0, H0-K0, and D0-K0 (upper panels) and D0-G1, D0-H0, and G1-H0 (lower panels). The baseline ground lengths for D0-H0/H0-K0/D0-K0 and D0-G1/D0-H0/G1-H0 are respectively 64 m/32 m/96 m and 72 m/64 m/72 m. The left panels represent Epoch A whereas the right ones represent Epoch B. The position angle variation of the configuration between the two epochs is less than 1 degree for D0-H0-K0 and less than 5 degrees for D0-G1-H0.
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