Integral fluence spectra of AD774/775 event taking into account the reconstructed ESPE events around AD993/994, AD774/775, 660 BCE, and 1776 BCE. Here, the gray shade represents the spread of integral fluence values presented in Koldobskiy et al. (2023), while the filled circles show the integral energy-dependent mean of each fluence bin and the solid black line represents the corresponding band fit. The solid orange line and envelope are similar to those of Fig. 2.