Fig. 18.
Temporal variation of the three WDH parameters in the case of the 51 Eri IFS data taken with SPHERE on September 25, 2015. Left: direction as a function of time compared to the variation of the parallactic angle (blue dashed line). Middle: strength as a function of time. Right: asymmetry factor as a function of time. In the three cases, the gray dash-dotted line defines the moment when the target crossed the meridian (airmass of 1.08).
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