Fig. 1.
Hard X-ray NuSTAR observations of blazar sources showing light curve and flux-HR relation, ZDCF, and spectral fit from top to bottom for the sources 3C 279, Mrk 501, 3C 279, and S5 0716+714, respectively. The color bars in light curve and the flux-HR plots represent the HR and time, respectively. Similar plots for other sources are shown in Appendix A.
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