  We define a bulk wormhole geometry interpolating between horizons of
differing size and determine characteristics of the HRT surface in these
geometries. This construction is dual to black hole mesostates, an intermediate
coarse-graining of states between black hole microstates and the full black
hole state. We analyze the distinguishability of these objects using the
recently-derived holographic Holevo information techniques, demonstrating novel
phase transition behavior for such systems.
