Fig. 3
From: Physical properties of the tunic in the pinkish-brown salp Pegea confoederata (Tunicata: Thaliacea)
Refractive indices estimated by ellipsometry. a Refractive indices of seawater (dotted line), the tunic of Pegea confoederata with mantle (1, thick line) and the tunic without mantle (2–3, thin lines). The refractive index of seawater (35 ‰, 25 °C) is calculated from the equation [14] that is valid from 400 nm to 700 nm. b Difference in refractive indices between the tunic specimens and seawater