Module axis 

Functions

draw_gridlines

Draw gridlines for both axes.

draw_sec_x_axis

Draw a secondary x axis along the top of the panel (ggplot2’s scale_x_continuous(sec.axis = …) / dup_axis(), #409).

draw_sec_y_axis

Draw a secondary Y axis on the right side.

draw_x_axis

Draw the X axis: ticks, labels, and title.

draw_y_axis

Draw the Y axis: ticks, labels, and title.