Stata: storing "Post_avg" regression coefficient from csdid

Question

I'd like to be able to store and save the "Post_avg" regression output from Stata's csdid command so that I can automate the production of regression tables. When I try

**egen gvar = csgvar(dep_var), tvar(year) ivar(tract)

csdid ind_var dep_var [iweight = rental_units], ivar(tract) time(year) gvar(gvar)

estat all

estat event

est sto a1

estout a1 using "reg_table.xls", replace**

it saves the group-time regression coefficients but not the event study coefficients: Pre_avg, Post_avg, and Tm+ and Tp+. How can I make my regression table?