I would like to insert in my thesis the value of the radiation density parameter today with its appropriate error and I was checking the latest Planck results here. I am a bit confused since I thought I could find directly $\Omega_{rad}$ or deriving it using the value of the radiation Temperature $T_0$. But I couldn't find either of them.

It would be enough the result only for photons since we have to make some assumptions for the neutrino one.


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If interested, following Where is radiation density in the Planck 2013 results? and using the result in https://arxiv.org/abs/1807.06205 you can find the photon density parameter


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