st: area between reference lines

["Robert Duval" <rduval@gmail.com>]

Dear all,

Does anyone knows how to fill the background area between two
(vertical) reference lines in a twoway line graph?

The idea is to shade the background of a specific (vertical) region of
the graph to indicate that during those years (x axis) the economy was
in a recession.

Any help will be greatly appreciated
robert
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