*-4.5 线型的控制
help connect_options
help linepatternstyle
help linestyle
sysuse sp500, clear
twoway connect open close low date in 1/10
twoway connect open close low date in 1/10, lstyle(p1 p1solid)
twoway connect open close low date in 1/10, lstyle(p1 p1solid p3mark)