<p>I don't think the ordering of dimensions is going to make too much difference, it would only be a minor research idea anyway.  (Plus how do you make sure you're using the same ordering across the whole tree?  That will be a minor refactoring challenge.)  Anyway, I think this is ready to merge, so I can do that when you are ready (I guess you can do it to, so if you want to, go ahead).  I guess it should be added to <code>RAModel</code> too, but if you like I can do that after merge.</p>

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