Adds vertical lines in the plot region.
xline(x, ...)
Values on x axis specifying location of vertical lines.
Any ploting options for abline.
yline, abline
# NOT RUN {
plot( 1:10)
xline( 6.5, col=2)
world( col=3)
yline( seq( -80,80,10),col=4, lty=2)
xline( seq( -180,180,10),col=4,lty=2)
yline( 0, lwd=2, col=4)
# }
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