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Normalisation of nl pt bias parameters #1246

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@louisl3grand

Hello,

I am using the nl pt module, with coevolution relations for bias parameters.
I couldn't find in the docs if one should define the co-evolution b3nl parameter following

b3nl = 32/315 (b1 -1) 

like in Eq 21 of https://arxiv.org/pdf/1407.5668

or

b3nl = b1 - 1

like in https://arxiv.org/pdf/2008.05991 (section II D).

Is this factor 32/315 absorbed in the CCL (or in fast-pt ?) implementation ?

Cheers,
Louis

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