Add one more legend for yline

[Wenhan Yan]

I am currently using sdid and want to add the mean of outcome variable to the graph output, and I choose the treated group mean since the control group are synthetic. Here is the code I use for the graph:

eststo sdid_1: sdid r_wo state date treat, vce(placebo) covariates(pop_1000 r_black r_notwhite unemploymentrate income_per_capita r_HS r_college lgdp tdate tstate, optimized) seed(1234) graph g1on ///
g2_opt(yline(0.08, lp(dash) lc(black)) ytitle("Crime involving drug only without possession") ylabel(0.08 "0.08") note("Black dash line means the mean of treated group"))

*obtain the mean of the treated group since control group are synthetic
matrix ytr = e(series)[1..25,3]
svmat ytr

sum ytr1
local treated_mean: di %3.2f r(mean)

    Variable |        Obs        Mean    Std. dev.       Min        Max
-------------+---------------------------------------------------------
        ytr1 |         25    .0803029    .0073493   .0670233   .0947042

Actually the number 0.08 is I obtain from following, and I ran the code again with the number

*obtain the mean of the treated group since control group are synthetic
matrix ytr = e(series)[1..25,3]
svmat ytr

sum ytr1
local treated_mean: di %3.2f r(mean)

    Variable |        Obs        Mean    Std. dev.       Min        Max
-------------+---------------------------------------------------------
        ytr1 |         25    .0803029    .0073493   .0670233   .0947042

And generate graph above, but this is not what I want. I want to have the legend information about the yline, also I don't want the y label to disappear, just want to emphasis the number of the mean which is 0.08 in this case. Sorry I use the paint tool to edit the graph to show what I really want.