Table 1. Photophysical parameters for GCaMP6m.

	εmax M-1cm-1		φ		σ2 GM		n		pKa
	(λabs, nm)		(λfluor, nm)		(λabs, nm)
	Neutral	Anionic	Neutral	Anionic	Neutral	Anionic	Neutral	Anionic
Ca2+-free	37,300	73,600	0.041	0.56	140	54	0.97	0.03	8.01,10.08
	(403)	(514)	(514)	(516)	(790)	(930)			8.68*
Ca2+-saturated	37,700	83,100	0.048	0.63	---	50	0.49	0.51	7.10
	(397)	(497)	(512)	(513)		(930)			6.90*
				0.61*

Extinction coefficient (ε); quantum yield (φ); two-photon cross-section (σ₂); relative concentration of chromophore (n), previously reported values for GCaMP6m are in italics.

*[1]