Figure 6
From: Nanobob: a CubeSat mission concept for quantum communication experiments in an uplink configuration
Histogram of the Fried parameter at 810 nm, based on observations from January 2, 2009 to April 22, 2017 at the Observatorio del Roque de los Muchachos (ORM) at La Palma [46]. The histogram includes 228 days per year; during the remaining 137 days no measurements were possible due to overcast or technical problems. During 112 days/year \(r_{0} > 20~\mbox{cm}\) (green area in the histogram)