Dear all,

I would like to add to an overlay plot a legend, that gives for every color used the name of the region. Here I got 3 regions, that are already labeled, but for some reason the code below only produces a legend showing mean_var three times. What am I doing wrong?

Code:
graph twoway line mean_var year if year<2020 & region==1 || line mean_var year if year<2020 & region==2 || line mean_var year if year<2020 & region==3
Best,
Julian