The y axis shows the elevation in m, and the x axis (along-track distance) refers to the distance (in m) from the start of the ICESat-2 track. The lakes shown are: a, Antelope Lake, California, USA (40.179, −120.595). b, Crater Lake, Oregon, USA (42.939, −122.109). c, Fern Ridge Lake, Oregon, USA (44.096, −123.301). d, Trinity Lake, California, USA (40.961, −122.681).