PaXExpandInEpsilon is an option for
PaXEvaluate. If ImplicitPrefactor is not
1 and SubstituteEpsilon is set to
True, then the value of PaXExpandInEpsilon
determines whether the final result should be again expanded in
Epsilon.
The expansion is done only up to \mathcal{O}(\varepsilon^0). The default value
is True.