Add plot of Wood-Anderson response to inventory plot

How can I plot the response of a Wood-Anderson seismograph along with the responses in an inventory?

I can plot the inventory responses:

inv = obspy.read_inventory( fileXML )

And I can get the response of the W-A:

paz_wa = {'sensitivity': 2800, 'zeros': [0j], 'gain': 1,
          'poles': [-6.2832 - 4.7124j, -6.2832 + 4.7124j]}

But I can’t work out how to get them on the same plot (amplitude only).

You could set up a Response object using this helper routine and then use that for plotting: