Facetting with factorised variables and geom_hline / geom_vline...

Label hline in facetwrap ggplot2...

Legend geom_hline not in right order...

geom_hline or geom_vline does not seem to accept vector for reference line, if called inside a funct...

How can I efficiently create a manual legend when using a loop to create multiple geom_hline objects...

Error bar on hline in ggolot...

R ggplot2 color mapping with geom_hline...