Dear all,

I was wondering if anyone could point me in the right direction on how to produce a shaded graph in Stata.

Let's say I have data on the prices of 3 products over an 8-year period (annual price observations) and I'd like to plot the price trends.

Code:
graph twoway (line prod1 prod2 prod3 year, clcolor(blue red green)), ///
xlabel(2009(2)2016) xtitle("") legend( symys(*.5) symxs(*.5) size(3) region(c(none)) ///
bm(tiny) rows(1) order(1 "Product 1" 2 "Product 2" 3 "Product 3") )
graph display, scheme(sj)
I'd like to produce a shaded figure where the the background is shown in white for 0-100, in light gray for 101-150, and slightly darker gray for 151+.

Is this possible to accomplish?

Thank you very much.