Table 1.

Single-channel parameters at saturating cGMP (700 μm) for Na⁺ and K⁺ currents at +100 mV

	K+i/K+o	Na+i/Na+o
i (pA)	2.0 ± 0.13 (10)	3.6 ± 0.17 (6)
σ (pA)	0.20 ± 0.013 (3)	0.33 ± 0.015 (3)
σ/i	0.100 (3)	0.092 (3)
Po	0.94 ± 0.024 (4)	0.81 ± 0.030 (3)
τof (ms)	17.5 ± 1.09 (312)*	2.59 ± 0.04 (307)*
τos (ms)	61.9 ± 0.69 (312)*	11.0 ± 0.30 (307)*
Af	0.27 ± 0.016 (312)*	0.79 ± 0.015 (307)*
As	0.73 ± 0.026 (312)*	0.21 ± 0.011 (307)*

i, amplitude of the single-channel current; P_o, open probability; σ_n1; RMS noise of the open level determined with eqn (7); σ_n1/i, RMS noise of the open level normalized with respect to i; τ_of, fast open time constant; τ_os, slow open time constant; A_f, amplitude of the fast component of the open time; A_s, amplitude of the slow component of the open time. The numbers in parentheses indicate the number of patches or the number of individual openings

^(*)included in the statistics.