Surface model of the IS2 reference brain
Cachero S., Ostrovsky A.D., Yu J.Y., Dickson B.J., and Jefferis G.S.X.E. (2010). Sexual dimorphism in the fly brain. Curr Biol 20 (18), 1589-601. doi:10.1016/j.cub.2010.07.045
if (FALSE) {
# Depends on nat
plot3d(IS2.surf)
}