Figure 1 of Thao, Mol Vis 2014; 20:125-131.

Figure 1. The comparison of decay signals between two different glycerol/water solutions. Low viscous glycerol/water solutions such as 2.5 cP quickly reach equilibrium so the curve resembles one-phase decay. Higher viscosity glycerol/water solutions exhibit distinctive two-phase decay as demonstrated with the 10.8 cP solution.