R help - May 2014 - could I smooth the geom_line output on ggplot2?

hi,
I have got some data and draw a line graph with ggplot2 geom_line. The
output seems too sharp to me, is there any way to smooth it?
I mean smooth the line, NOT ADDING a smooth line. Or there is other
functions in ggplot2 can help me out with a smooth line?

Thank you.

-- 
Stand Alone Complex

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