Delicate windows into evaporating black holes

A bstract We revisit the model of an AdS 2 black hole in JT gravity evaporating into external bath. study when, and how much, information about interior can be accessed through different portions Hawking radiation collected bath, we obtain corresponding full quantitative Page curves. As a refinement previous results, describe island phase transition for semi-infinite segment establishing access to times within regime applicability model. For finite-size segments one needs include purifier microscopic dual together with order information. identify four scenarios entropy evolution this case, including possibility where reconstruction window is temporarily interrupted. Analyzing structure curve finite length comparable time, demonstrate that it very sensitive changes parameters also discuss subregion complexity during evaporation.