Click here to see the SAS code.
Click here to see the example.

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When a chart has a lot of bars, and it's difficult to visually 'group'
them and follow the bars down to the horizontal axis, it is sometimes
useful to make certain bars a different color, to use them in a similar
way to reference lines.

You can add a variable to the dataset, such as ...

 if int(age/10)=(age/10) then even_10='y';
 else even_10='n';

And then use that variable to color the bars (using the subgroup option).

proc gchart data=my_data anno=anno_age;
format early_voters comma8.0;
vbar age / discrete type=sum sumvar=early_voters
 subgroup=even_10 nolegend
 noframe raxis=axis1 maxis=axis2
 autoref cref=graydd clipref
 space=0 coutline=gray99
 html=my_html
 des='' name="&name";
run;



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