| lineMarks | R Documentation | 
to add horizontal or vertical lines to a list of ggplot objects
lineMarks(
  graphs,
  vlines = NA,
  hlines = NA,
  vlinesAttributes = linesMarkDefaults(),
  hlinesAttributes = linesMarkDefaults()
)
graphs | 
 a ggplot object or a list of ggplot-objects to which the lines have to be added  | 
vlines | 
 a numeric vector defining where the vertical lines are to be placed  | 
hlines | 
 a numeric vector defining where the vertical lines are to be placed  | 
vlinesAttributes | 
 list which defines the type of line to be used for vlines parameter  | 
hlinesAttributes | 
 list which defines the type of line to be used for hlines parameter  | 
a list of ggplot objects
due to the graphs parameter you can use: list(ggplot objects)
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