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Negative logarithmic relationship between longevity (days) and equilibrium relative humidity (RH) for Dactylorhiza fuchsii pollen stored at 6 and 16 °C. Lines are fitted following probit analysis of data presented in Fig. 3. At 6 °C, log σ = 2·392–0·018 RH (r2 = 0·951); and at 16 °C, log σ = 2·390–0·023 RH (r2 = 0·948).
