HIGHLIGHTS
SUMMARY
The fourth challenge is a practical one found by the authors: the SSC gives an ill-conditioned covariance matrix so that the inversion becomes unstable when the other covariance term becomes negligible (e_g, when an analysis is pushed in the deep non-linear regime or in a combined probe case with large matrices). The S matrix is the covariance matrix of these δb in each redshift bin, due to the clustering of matter. ∂δb O is the reaction of the probe δb, also known as the response. In practice, this response is computed either . . .
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