venn chart unexpected results

[Stef]

I am confused over the arguments that you need to provide to generate a venn diagram, particularly with three groups. (Sorry, posted this in the Visualization API group previously but realized it should go here.)

Example:

I want to generate a venn from three groups: A={a}, B={a,b,c}, C={a,b,c,d,e}. Then common in A and B are 1, common in A and C are 1, common in B and C are 3 and common in all are 1. Therefore the data of the chart should be as follows: chd=t:1,3,5,1,1,3,1. However, we get this:

while we want this, but to get it we need to enter chd=t:1,3,5,1,1,3,0:

So, it is not clear to me how we need to specify the arguments. If the intersection arguments (4-6) are exclusive we would need to specify chd=t:1,3,5,0,0,2,1, but that also doesn't give a satisfactory result:

Who knows more about this?

Cheers!

Stefan