Like Wikipedia images are problematical. Part of Figure
2, Image A, comes from
http://anthro.palomar.edu/vary/ Modern Human Variation which has the
following restrictions which limit commercial use
http://anthro.palomar.edu/tutorials/terms_and_conditions.htmwhich
So it turns out that this image is incompatable with the GNU Free
Documentation License as we interpret it. Also just where any image in a
Public Library of Science journal comes from is hardly transparent although
they give at least a general source for them. For example for Figure 1 the
following statement: "This diagram is based on one published by Sturm et
al. (1998) and summarizes data from Szabo et al. (1969), Toda et al.
(1972), and Konrad and Wolff (1973)" These references are included but due
diligence might require you look at the diagram in Strum et al.
Fred
But dig a little deeper under the link Illustration credits and one finds:
" 2. Map of human skin color distribution ca. 1500 A.D.
produced by Dennis O'Neil from "Distribuzione della Varia Intensit· del
Colore della Pelle" in Renato Biasutti, Le Razze e i Popoli della Terra:
Volume Primo--Razze, Popoli e Culture (1959) (see note)
http://anthro.palomar.edu/vary/note.htm
So as usual it all ends in a fog of uncertainty.
Fred