guys, i am in trouble. basically i have been tasked to replicate some results from a paper on cosmology that requires to use Monte Python or similars software to find the best fit parameters for some non conventional cosmological models. the problem is that i do not understand how to modify the settings to switch models and i cannot find a good example. all i want is for example how to tell to the mcmc sampler to consider w(z) =w_0 + w_a(z) (linear redshift model). is there any physicist here who can help me? i am just an undergrad ffs