Table 1.

Parameter values used for plots

Notation	Definition	Value	Ref.
$q$	unit motile charge	0.8 $e$	Iwasa (21)
$a$	unit displacement	$0.67\times {10}^{-4}$ nm	see text
$N$	number of units	$3\times {10}^7$	see text
$C_0$	structural capacitance	30 pF	Mammano and Ashmore (19)
$\sigma$	membrane conductance	10 nS	Mammano and Ashmore (19)
$i_0$	baseline current	0.3 nA	see text
$k_o$	OHC stiffness	17 mN/m	Iwasa and Adachi (12)
$K_e$	BM stiffness	20 mN/m	Gummer et al. (22); Olson et al. (23)
$g_x$	HB sensitivity	1/(25 nm)	Russell et al.(24)
$\eta$	drag coefficient	$0.8\times {10}^{-7}$ N/m	see text

The values chosen are for a 40 $\mu$m OHC and are assumed to correspond to the 4 kHz location in guinea pigs. Note: $e$ is the electronic charge of $1.6\times {10}^{-19}$ C. BM, basilar membrane; HB, hair bundle.