PaXSeries is an option for PaXEvaluate. It
allows to expand Passarino-Veltman functions around given variables.
The expansion is done by LoopRefineSeries and the syntax
is the same as with the ordinary Series,
e.g. PaXSeries -> {{m0,0,2}} or
PaXSeries -> {{SPD[p1,p1],pp1,0},{SPD[p2,p2],pp2,0}}.