Fig. B.1.
Results of the grid search for the binary position of each epoch. The logarithmic χ2-maps show a cut through the (α, β)-plane, with the best value of flux ratios at each position. The red ellipses show the position of the global minimum on the map, which coincides with the position of the secondary component selected to derive the orbital parameters. The exception is Run E, where the selected position of the secondary (black ellipse) is not the global minimum but a nearby local minimum. (a) 2011-Feb-10 (A). (b) 2012-Mar-06 (B). (c) 2012-Jul-02 (C). (d) 2015-Feb-05 (D). (e) 2015-Feb-13 (E). (f) 2017-Mar-09 (F). (g) 2019-Jun-20 (G). (h) 2020-Jan-28 (H). (i) 2020-Jan-30 (I).
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