Extended Data Fig. 4: The frequency distribution and Gaussian fitting of the length-to-width ratio of the melanosomes in the eyes of the Chengjiang vertebrates.
From: Four camera-type eyes in the earliest vertebrates from the Cambrian Period
a, Haikouichthys ercaicunensis (n = 549). b, myllokunmingid sp. (n = 500). n refers to the measured number of melanosome microbodies. xc: peak centre value; R2: regression coefficient.
