Hello Alan.

> Even NP0 do have a change in capacitance with temperature.  It is just
> that it is relatively small compared to other ceramic capacitors, and
> is probably swamped by the temperature effects of other items in the
> circuit.

> Your best selection is probably polystyrene if you want the very best
> temperature stability.

  Yea!  That's what I said.  Nice to agree.
--
  Cheers,
        Paul B.