r - Create a straight faint dotted/dashed line through y=0 -

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i want able draw faint dotted or dashed line through y=0 make more obvious when plotted line goes below 0. if possible id whole area of graph below y=0 line lightly shaded show better when plotted line drops below zero.

here example of type of graph want shade/draw line:

http://s27.postimg.org/v94uey56r/rplot02.png

there lots of different graph types doesnt have specific, aslong works have general idea of enough :)

thankyou

how abline(h = 0, lty = 2)?


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