Cosmic shoreline compared to He I observations. He I non-detections are denoted by red error bars with no marker. He I detections are circles scaled by their R_p and colour-coded by their stellar age (lateral colour bar). Instellation relative to Earth vs escape velocity (left panel) and cumulative instellation in the XUV range relative to Earth vs escape velocity (right panel) graphics. We marked the cosmic shoreline, as I ∝ υ_esc4, from Zahnle & Catling (2017, solid green line) and constrained from the observations (dashed black line). Planets sitting above or on the cosmic shore and with H/He detections are labelled.