```
x <- rnorm(100)
y <- x + rnorm(100)
lmfit <- lm(y~x)
plot(x, y, xlim=c(-3.5, 3.5))
ablineclip(lmfit, x1 = -2, x2 = 2, lty = 2)
ablineclip(h = 0, x1 = -2,x2 = 2,lty = 3, col = "red")
ablineclip(v = 0, y1 = -2.5, y2 = 1.5, lty=4, col = "green")
```

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