An array of point-sets with each point-set playing a role of a bin in a histogram.
When a new point is added to a REvePointSetArray, an additional separating quantity needs to be specified: it determines into which REvePointSet (bin) the point will actually be stored. Underflow and overflow bins are automatically created but they are not drawn by default.
By using the REvePointSelector the points and the separating quantities can be filled directly from a TTree holding the source data. Setting of per-point TRef's is not supported.
After the filling, the range of separating variable can be controlled with a slider to choose a sub-set of PointSets that are actually shown.