Fig. 2
Top panel: spectrum around the Brγ line for the night 2019-06-22. The gray area shows the extent of the Brγ line profile. Bottom panel: mean of the differential phase of the three baselines UT4-UT3, UT4-UT2, and UT4-UT1 for the night 2019-06-22. The standard deviation of the summed signal is 0.16°. The averaged phase signal is detected across the line profile at the 4σ level.
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