| lineAttributes | R Documentation | 
helper function to provide line properties
lineAttributes(size = 1, linetype = "solid", color = "black", alpha = 1)
size | 
 width of the line  | 
linetype | 
 linetype (solid, dotted, etc) of the line  | 
color | 
 color of the line  | 
alpha | 
 alpha ('see through' factor) of the line  | 
a list object of parameters
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