Table 4.

Minimum ChR2 expressions needed to achieve a threshold of 1 mW/mm, 20 ms pulse by illuminating some axon parts

	Length [m]	Area [m2]	ChR2 density [pS/m2]	Total ChR [nS]
Unmyelinated AIS	50	200	157	31.4
Unmyelinated axon	400	1278	15	19.2
Myelinated axon	400	11.4	1100	12.5
demyelination
			1130	12.9
			1172	13.4
			1229	14.0
			1271	14.5
			1329	15.2

For the myelinated axon, the length of nodes of Ranvier was 1 m, internode distance m and F/cm

ChR2 in nodes only