BarChart using barSpace = 0 problem (CG rounding issues)

Hi,

I am trying to create a graph for sleeping data like this:

So for this i am using bar stack bar chart with 3 types of colors and only 1 at a time gets a value, the problem is even though i am using barSpace = 0 i am getting little spaces between values when i have more than 10 entries, for example when i have 100 this is what i get:

Is there any way to avoid the small separating lines between each bar entry?

Thanks,
Gal