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(A) Vopt dual-hump AP from Fig. 6, trace iv, together with the same signals obtained upon variations of penetration depths at illumination and emission wavelengths by 0.5, 1.0, and 1.5 times their default values. The corresponding Vm trace is also shown. (C and D) Changes in resting potential and dual-hump ratio for variations in penetration depths as in A. Panel B shows how quantities in C and D are measured.
