γ-ray SED obtained from the events in 0.1–1000 GeV shown as black data points. The gray solid line shows the best-fit PL spectra for each component. The dashed lines show the 68% confidence bands. The arrows indicate the 95% upper limits when the TS value is lower than 4 in a given bin. The blue data points are the VERITAS results (Abeysekara et al. 2018). The red butterfly was extracted from Abeysekara et al. (2017b). The gray histogram denotes the TS value for each bin.