Correction to: Astrophys Space Sci (2020) 365:41 https://doi.org/10.1007/s10509-020-3748-0

In the Discussion section of the initial online publication an incorrect percentage was specified for the observed contribution of the hard X-ray tail in the middle and upper flaring branch to the total flux of 3.0–80.0 keV. The original article has been corrected.