Table 1. Double Debye Parameters for Water, Healthy Human and Rat Skin.

	ε∞	ε2	εs	τ1 (ps)	τ2 (ps)
Water (transmission)a	3.5	4.9	78.4	8.2	0.18
Water (reflection)b	4.1	6.6	78.8	10.6	0.18
Human skin (volar forearm)b	3.0	3.6	60.0	10.0	0.20
Human skin (epidermis)c	3.0	3.6	58	9.4	0.18
Euthanized rat normal skin (dorsal)	3.0	3.6	60.0	<2.2 − 5.19>	0.2

^a From Kindt and Schmuttenmaer J. Phys. Chem. 100, 10373 (1996).
^b From Pickwell et al. APL 84, 2190 (2004).
^c From Pickwell et al. Phys. Med. Biol. 49, 1595 (2004).