betaks                  Calculates Beta and Ks
coastlines              Coastlines
ray                     Calculates the Rossby waves ray paths
ray_path                Calculate the ray paths / great circles
ray_source              Calculate the Rossby waves ray paths over a
                        source region
raytracing              raytracing: Rossby Wave Ray Tracing
trin                    Performs trigonometric interpolation
ypos                    Interpolation selecting the nearest neighbor
