st: graphing question - how to smooth lines connecting observations

[Zamira S <zamira_s@hotmail.com>]

I am trying to generate a graph with smooth-looking lines connecting the observations. In excell it is an option but I am trying to avoid going back and force between excell and stata. Any suggestions would be greatly appreciated. Here is what I have:
 
twoway (connected growth timeline, lcolor(black) lpattern(solid) lwidth(medthin) msymbol(circle) mcolor(black)), ytitle(GDP per capita growth) yline(0 2, lwidth(vvvthin) lcolor("192 192 192")) xtitle(Time) xlabel(-3(1)9) xline(-0.1 1.1 5.1, lcolor("87 87 87") lpattern(dash)) title(GDP Per Capita Growth (%)) subtitle(Constant US$) saving(growth, replace)
 
Thank you
Zamira 		 	   		  
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