I have been trying to combine a kdensity graph and a histogram of the
same distribution, but I would like to have the axis for the histogram
in frequencies, not densities. I have experimented with using individual
axes for both the histogram and the density line, but then the two
results don't match anymore. 
Here is a command I have been using:
_kdens variable ,kernel(triangle) ll(0) gen(y x)
twoway (hist variable ,freq ) (line x y ,lcolor(black) lstyle(solid)
yaxis(2) ytitle("",axis(2)) ylabel(none,axis(2))  ) , legend(off) 
Is there any solution for this problem? Using density and "faking" (i.e.
relabeling) the axis for the histogram?
Any help is appreciated.
Daniel Schneider
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