The LST for the ~2 PM MODIS overflight of Ojos del Salado during the thawing season of 2017 isshown for Site #2 in Figure 3. The plateau near 0 ◦C between June 20 and July 14 is the zero curtain.2 PM is near the peak of the diurnal temperature cycle, and thin ice films forming at night will likely not register then. The lack of LST records reflects the cloudy days