It looks like Maarten's is a superior solution, you can, however,
break up the second -line- statement. For example (note, you
probably want the black line drawn last so it will be on top of the
other lines):
sysuse auto,clear
rename mpg mpg_1000
forv i = 10(10)900 {
gen mpg_`i' = mpg_1000+invnorm(uniform())*10
}
twoway line mpg_?? price, sort lw(vthin ..) lc(gs10..) ///
|| line mpg_1?? price, sort lw(vthin ..) lc(gs10..) ///
|| line mpg_2?? price, sort lw(vthin ..) lc(gs10..) ///
|| line mpg_3?? price, sort lw(vthin ..) lc(gs10..) ///
|| line mpg_4?? price, sort lw(vthin ..) lc(gs10..) ///
|| line mpg_5?? price, sort lw(vthin ..) lc(gs10..) ///
|| line mpg_6?? price, sort lw(vthin ..) lc(gs10..) ///
|| line mpg_7?? price, sort lw(vthin ..) lc(gs10..) ///
|| line mpg_8?? price, sort lw(vthin ..) lc(gs10..) ///
|| line mpg_9?? price, sort lw(vthin ..) lc(gs10..) ///
|| line mpg_1000 price, sort lw(thick) lc(black) ///
|| , legend(off)
Scott
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