Despite the claims in the documentation for ec.Subpopulation, ec.subpop does not appear to work as a default base.
On CVS it does now. :-) The default base is "ec.subpop".
It works, but only for subpopulation 0. Specifically, if I
ec.subpop.size = 500
I get this message:
Subpopulation size must be an integer >= 1.