Array
I've generated the figure above and would like to make two line segments on the X-axis, one to the left of 0.0286 and the other to the right of 0.0314. Here's the code I have so far:

Code:
   #delimit;
   twoway 
   function y=normalden(x,0.03,0.0007), range(0.0272 0.0328)              ///
              graphregion(color(white)) clstyle(foreground) ||, 
   plotregion(style(none))
   legend(off)
   xtitle("Mean sulfur dioxide concentration (ppm)")
   xlabel(0.0286 0.0293 0.0300 0.0307 0.0314, format(%6.4f))
   ylabel(none)
   yscale(off);
   #delimit cr
Is there a way to do this? Any help would be appreciated.