Table 4.
Constraints on S8 (α = 0.50) and Σ8 (α free).
| Setup | Statistic | α | χ2 | dof | PTE | ![]() |
Marginal | Max. Apost. | Marginal | |
|---|---|---|---|---|---|---|---|---|---|---|
| Mode+HPDI | +PJ-HPD | Mean + CI | ||||||||
| S8 | Fiducial | En | 0.50 | 127.8 | 120.5 | 0.307 | 18 | ![]() |
![]() |
![]() |
| S8 | Fiducial | CE | 0.50 | 151.0 | 162.5 | 0.731 | 6 | ![]() |
![]() |
![]() |
| Σ8 | Fiducial | En | 0.58 | 127.8 | 120.5 | 0.307 | 23 | ![]() |
![]() |
![]() |
| Σ8 | Fiducial | CE | 0.60 | 151.0 | 162.5 | 0.731 | 19 | ![]() |
![]() |
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Notes. α in this table refers to the exponent in the equation Σ8 = σ8(Ωm/0.3)α. When α = 0.5 (upper section) reported constraints are for S8. Otherwise, constraints are for the optimal degeneracy direction for each statistic, thereby showing the maximal constraining power. We report the χ2 of the best-fit (i.e. maximum a posteriori) model for each statistic, and the number of effective degrees of freedom (dof, computed as
where
is estimated as described in Appendix B of Stölzner et al. 2025). We compute the best-fit probability-to-exceed (PTE), which indicates the fraction of possible data vectors, drawn from a generative model described by our best fit, that would be at least as extreme as our observed data vector. We provide three constraints over our primary cosmological parameters per setup: the marginal mode and marginal highest posterior density interval (HPDI), the marginal mean and standard deviation, and the maximum a posteriori point and projected joint highest posterior density interval (PJ-HPD). The latter statistic can be noisy in the limit of few samples
residing within the PJ-HPD, and so we also provide the number of samples in the PJ-HPD region as a guide.
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