sysuse uslifeexp, clear
gen diff = le_wm - le_bm 
label var diff "Difference"

#delimit ;
line le_wm year, yaxis(1 2) xaxis(1 2) 
  || line le_bm year 
  || line diff  year
  || lfit diff  year
  ||, 
  ylabel(0(5)20, axis(2) gmin angle(horizontal))
  ylabel(0 20(10)80,     gmax angle(horizontal))
  ytitle("", axis(2))
  xlabel(1918, axis(2)) xtitle("", axis(2))
  ytitle("Life expectancy at birth (years)")
  title("White and black life expectancy")
  subtitle("USA, 1900-1999")
  note("Source: National Vital Statistics, Vol 50, No. 6" 
       "(1918 dip caused by 1918 Influenza Pandemic)")
  legend(label(1 "White males") label(2 "Black males"))
  legend(col(1) pos(3))
  ;
#delimit cr