Theoretical emission spectra transformed to eclipse depth for EPIC 219388192b (CWW 89Ab). Only the thermal components are included (internal and absorbed stellar sources). Blue: T_int = 1900 K – fit to the Spitzer data within 1σ; gray: T_int = 944 K – BD evolutionary temperature. For the star we used the BT-NextGen models (Allard et al. 2012), whereas for the BD we employed the ATMO models of Phillips et al. (2020). Green horizontal bars show the theoretical depths in the Spitzer wavebands. Red dots with error bars show the observed depths by Beatty et al. (2018). The third red dot in the left bottom corner is the eclipse depth in the Kp filter. The inset zooms in on this region, indicating the expected eclipse depth for the reflectivity levels shown. Horizontal error bars indicate the equivalent filter width. See text for further details.