[.indicatrix_list       Subset an indicatrix_list
indicatrix              Compute Tissot indicatrix ellipse geometry
plot.indicatrix         Plot an indicatrix
plot.indicatrix_list    Plot a list of indicatrixes
ti_ellipse              Generate ellipse coordinates for an indicatrix
tissot                  Compute Tissot indicatrix properties
tissot_get_proj         Get or set the current plot projection
tissot_map              Plot world coastline on a projected map
tissot_unproject        Unproject coordinates to geographic (lon/lat)
                        CRS
world                   World coastline
