Fig 1.

Homogeneous volume-based freezing nucleation rates of ice in supercooled water. Symbols and solid lines give raw laboratory data and least-square fits to these data. Note that the least-square fit line to the data presented by open circles (27, 28) is omitted for clarity. The numbers in parentheses give the droplet size range in units of μm. The dashed line gives the homogeneous freezing rate provided by Pruppacher and Klett (1). The error bars show the reported range of measurement uncertainties.