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add vertical line on trace panel
vline(x, per = 1, COL = 1, NUM = FALSE, LAB = 1:length(x), lwd = 0, lty = 1)
vector of x-locations
percent of window
color
number lines
character labels
line width
line type
Graphical side Effects
adds vertical lines to plot
plocator
# NOT RUN { plot(c(0,1), c(0,1), type='n') vline(runif(4), COL ='red') # }
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