Dashed black and white line always visible

If you have a graph with lot of black dots on some places without dots, a black or white line will not be visible on some part of the plot. A solution is to draw a dashed white and black line. Here is how to do:

> a <- 1:10000
> a <- 1:1000
> b <- a+rnorm(1000, a, a)
> plot(a, b, bty="n", las=1, pch=19)

> abline(a=0, b=1, col="black")
> abline(a=0, b=1, col="white", lty=2)

> abline(a=100, b=1, col="white")
> abline(a=100, b=1, col="black", lty=2)


Note that the white and black segments are shifted depending on the order of the white or black segments.

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