Fig. 6

The 6 VLTI/AMBER φdiff measured on Altair and δ Aquilae around Brγ at 2 different observing times (format YYYY-MM-DDTHH MM SS) and, for each time, three different projected baselines and baseline position angles, as indicated in the plots. The smooth curves superposed on the observations are the best-fit φdiff obtained without a differential rotation.
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