7.5.1. Liang–Zhang or *E* <sup>p</sup>–*E*iso–*t*<sup>b</sup> Correlation

The *E*p–*E*iso–*t*<sup>b</sup> correlation [135] has been proposed by purely considering phenomenological considerations, thus avoiding any theoretical assumption, unlike that made for the Ghirlanda correlation. However, as stated above, the *E*p–*E*iso–*t*<sup>b</sup> somehow shares similar implications and drawbacks to the Ghirlanda one, as well as analogous physical interpretation (see Sections 2.4 and 3.1.5 and Ref. [153], for details).

As proposed in Ref. [163], this correlation, like the Ghirlanda one, appears to be affected by a selection effect on *E*<sup>p</sup> (whereas, for the Ghirlanda correlation, *E<sup>γ</sup>* is affected as well) and suffers sample incompleteness.
