On Sun, May 10, 2009 at 12:22 AM, Tomasz Chmielewski wrote: > Sorry, could you be more specific (probably you meant the sum, $B-t(B)? > > How is activity chart calculated? For example, we have some threads having > one message, some 4 messages, but the activity chart is the same for them. The bar chart shows how those 4 or 1 message a distributed through time. The first bar corresponds to within one day. The second bar, between 1 and 2 days. They are all scaled so the largest bar fits the available space. Hence why the sum is also displayed as a scale indication.