Fig. 2
Temporal evolution of the peak of the VHE emission for each orbital period in terms of the MJD. MAGIC (magenta dots) and VERITAS (blue squares) data within orbital phases 0.5–0.75 have been considered. The gray dashed line represents 10% of the Crab Nebula flux, the gray solid line the zero level. The fit with a sinusoidal is plotted in red and the fit with a constant in blue.
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