I'm trying to reproduce Fig. 27 on page 39 of Planck Collaboration XIII (http://arxiv.org/pdf/1502.01589v2.pdf). My first attempt was to use

**equations_ppf.f90**instead of

**equations.f90**in

**CAMB**, but I think that just means that the underlying cosmology has a PPF dark energy model, but doesn't add w0 and wa as fitting parameters?

What I then need is to add w0 and wa as fitting parameters to the chains produced by CosmoMC, and my current attempts at this has so far failed. The older threads on this topic seem to not be valid for the version of CosmoMC I'm using (July 2015), and I couldn't find the answer in the ReadMe documentation either.

I'm sure it's possible, and I would greatly appreciate it if someone could provide an answer or point me in the direction of one.

Thank you!

- Per