From https://gist.github.com/jdarling/fb701fcaead21168cb7a

Really this is a hack that would be better off if it were in the base of crossfilter. As it is it will filter the data up properly but for some reason does not filter the data down properly.

What I mean is if you select something on the Inbound/Outbound chart the Inbound/Outbound Sums charts do not update accordingly but if you select data on any of the Inbound/Outbound Sums charts the other charts update accordingly.