st: line options for overlayed twoway kdensity plots

[Chris Hajzler <chajzler@gmail.com>]

Dear Statalist,

I am trying to change the line options (color, pattern) in an
overlayed kernel density plot using Stata version 8.

I have generated these plots using a command along the following lines:

twoway (kdensity x1 if (z==1), xscale(r(-1.7(0.5)1.7))) (kdensity x1
if (z==2), xscale(r(-1.7(0.5)1.7))), ytitle("stuff")

According to online Stata help files, " cline_options" are available
options using kdensity, such as lcolor and lpattern, but I am having
trouble figuring out how to include these options (or if, perhaps,
these options can only be used on more recent versions of Stata).  For
instance, if I try including "color(black)" or "lcolor(black)" as
either right before or right after the xscale option, I receive the
error message  "option lcolor() not allowed". (I know the density
function may not qualify as a line graph, so I have tried with and
without the "l" prefix, but this has not worked either.)

Does anyone know how I might change the density line colors/patterns?

Thanks in advance,
Chris
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