aes_contrast            A mapped aesthetic for text colour on fill
axis_bracket            Annotate an axis bracket
axis_line               Annotate an axis line
axis_text               Annotate axis text
axis_ticks              Annotate axis ticks
guide_sec_axis_text     Guide optimised for secondary axis text
                        annotations
panel_background        Annotate a panel background region
panel_grid              Annotate panel gridlines
panel_shade             Annotate a shaded panel region
reference_line          Annotate a reference line
sec_axis_text           Secondary axis for text annotations
