Table 2. Parameter variations that double the mean-squared error of the fits.

Error was measured while a single parameter was systematically varied; other parameters were held fixed at the consensus model values.

Parameter	Symbol	Units	Values: optimal [lower, upper]
			Primatecone	Mousecone	Primaterod	Mouserod
Opsin decay rate const.	σ	${\displaystyle {\mathrm{s}}^{-1}}$	22 [14, 34]	9.74 [7.3, 13.1]	7.07 [5.8, 8.8]	7.66 [6.1, 9.3]
PDE dark activation rate	η	${\displaystyle {\mathrm{s}}^{-1}}$	2000 [1300, 3300]	761 [494, 1218]	2.53 [2.1, 3.2]	1.62 [1.3, 2.1]
Ca2+ extrusion rate const.	$\beta$	${\displaystyle {\mathrm{s}}^{-1}}$	9 [5, 40]	2.64 [1.58, 5.7]	N.A.	N.A.
Ca2+ GC affinity	$K_{GC}$	${\displaystyle \mu \mathrm{M}}$	0.5 [0, 0.6]	0.4 [0.26 0.46]	0.5 [0.44, 0.53]	0.4 [0.32, 0.44]