sysuse nlsw88, clear
twoway (histogram wage) ///
(kdensity wage if collgrad==0) ///
(kdensity wage if collgrad==1), ///
xtitle("Hourly wage") ///
legend(label(1 "Full sample") ///
label(2 "Not College Graduate") ///
label(3 "College Graduate") ///
col(1) ring(0) pos(3))
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