Add labels to points on a twoway graph

[Marine Jouvin]

Hi,

I'm using the following code who give me the graph attached :

        graph twoway (lfit digit date, lpattern(dash) lcolor(grey) lwidth(vthin)) ///
                     (scatter digit date if coop=="A", mcolor(ltblue)) ///
                     (scatter digit date if coop=="B", mcolor(gray))    ///
                     (scatter digit date if coop=="C", mcolor(forest_green))    ///
                     (scatter digit date if coop=="D", mcolor(emerald))    ///
                     (scatter digit date if coop=="E", mcolor(orange))    ///
                     (scatter digit date if coop=="F", mcolor(orange_rd))    ///
                     (scatter digit date if coop=="G", mcolor(lavender))    ///
                     (scatter digit date if coop=="H", mcolor(ebblue))    ///
                     (scatter digit date if coop=="I", mcolor(cranberry))    ///
                     (scatter digit date if coop=="J", mcolor(pink))    ///
                     (scatter digit date if coop=="K", mcolor(olive_teal))    ///
                     (scatter digit date if coop=="L", mcolor(erose))    ///
                     (scatter digit date if coop=="M", mcolor(black))    ///
                     (scatter digit date if coop=="N", mcolor(sandb))    ///
                     (scatter digit date if coop=="O", mcolor(eltblue)),  ///
               xlab(22919 "01 Oct" 22950 "01 Nov" 22980 "01 Dec" 23011 "01 Jan" 23041 "01 Feb") ///
               xtitle("") ytitle("% of volume digitized ") ///
               legend(off)

I was wondering it it was possible to add some letters to some points to provide interpretation keys to readers ?