Image Details
Caption: Figure 3.
Histograms of the daily signal events Ns from Mrk 421. The left and right panels present the 3 yr data and the 2021 data, respectively; in each plot, the red, blue, and green correspond to a lognormal, a Gaussian, and the combination of the Gaussian and lognormal fit.
© 2026. The Author(s). Published by the American Astronomical Society.