Draw horizontal reference line — draw_horizontal_reference

Draws a horizontal reference line or multiple reference lines to plots

Usage

draw_horizontal_reference_line(
  reference_line,
  color = "grey",
  linetype = "dashed",
  size = 0.7
)

reference_line: input y coordinate of reference line(s). for multiple reference lines, concatenate individual values into a vector (required)
color: change reference line color. options are "grey", "blue" and "red". by default, it is set to "grey" (optional)
linetype: change line type. identical to linetype ggplot2 aesthetic. by default, it is set to "dashed" (optional)
size: change line thickness. identical to size ggplot2 aesthetic. by default, it is set to 0.7 (optional)

A horizontal reference line plotted on top of a 'ggplot' object