Rescaling Walther P(k) to match BOSS

To rescale the Walther \(P(k)\) ti match the BOSS \(P(k)\) on large scales, I find the simulation that minimizes \(\chi^2\) with respect to the Walther \(P(k)\) on large scales (\(k<0.02\)). Then I find the rescaling factor \(\alpha\) such that \(\alpha P(k)^{\mathrm{fit\, W} }\) minimizes \(\chi^2\) with respect to the BOSS \(P(k)\).

The results from the rescaling are shown below