Fig. 1
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Observed minus calculated (O − C) diagram of WASP-12b for the unpublished transits collected at Asiago (Tables 1 and 3). The reference ephemeris here is the linear part of Eq. (3), while the additional quadratic term (based on dP/dE) is plotted as a black solid line. An excess scatter in the data points with respect to the quadratic model can be seen in the figure. This is addressed in Sect. 4.4.
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