autoSmoothAPC           Smooths demographic data using automatically
                        estimated parameters and optionally taking into
                        account period and cohort effects
plot.matrix             Presents matrix as a heatmap
plot.smAPC              Presents demographic data as a heatmap
plot3d                  Presents data as a 3D surface
plot3d.matrix           Presents matrix as a 3D surface
plot3d.smAPC            Presents demographic data as a 3D surface
signifAutoSmoothAPC     Smooths demographic data using automatically
                        estimated parameters and taking into account
                        only significant period and cohort effects
smoothAPC               Smooths demographic data optionally taking into
                        account period and cohort effects
