Figure 2. Charge movements from fibres within 50 min of exposure to 0.2 mm caffeine show persistent delayed (q_γ) charging currents, following the application of graded depolarizing test steps (see horizontal bars below traces), that are particularly prominent between test voltages of −52 to −45 mV.

Fibre Z23 in 0.2 mm caffeine: temperature = 5.6 °C, R_i = 390 Ω cm. Initial cable constants: λ = 1.9 mm, r_i = 6992 kΩ cm⁻¹, d = 84.3 μm, r_m = 262.5 kΩ cm, R_m = 6.95 kΩ cm², C_m = 6.2 μF cm⁻². Final cable constants: λ = 1.7 mm, r_i = 8239 kΩ cm⁻¹, d = 77.6 μm, r_m = 226.3 kΩ cm, R_m = 5.52 kΩ cm², C_m = 6.2 μF cm⁻².