coord_proj              Similar to 'coord_map' but uses the PROJ.4
                        library/package for projection transformation
geom_bkde               Display a smooth density estimate.
geom_bkde2d             Contours from a 2d density estimate.
geom_xspline            Connect control points/observations with an
                        X-spline
ggalt                   Extra Geoms, Stats and Coords for 'ggplot2'
stat_ash                Compute and display a univariate averaged
                        shifted histogram (polynomial kernel)
