Reference

All functions
lines	lines
points	points
pois_cols()	poisson colours
pois_pal_disc()	Return function to interpolate a poisson colour palette
pois_pal_grad()	Return interpolated color gradient for a continuous poisson colour palette
scale_colour_disc_poisson()	discrete colour scale constructor for poisson colours
scale_colour_grad_poisson()	gradient colour scale constructor for poisson colours
scale_fill_disc_poisson()	discrete fill scale constructor for poisson colours
scale_fill_grad_poisson()	Gradient fill scale constructor for poisson colours