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Table 1.

Model parameters and their priors.

Type Parameter Prior Duplicated Description
Cosmological ωcdm 𝒰(0.051, 0.255) Yes Reduced cold dark matter density
ωb 𝒰(0.019, 0.026) Yes Reduced baryon density
h 𝒰(0.64, 0.82) Yes Reduced Hubble parameter
ns 𝒰(0.84, 1.1) Yes Spectral index of the primordial power spectrum
S8 𝒰(0.5, 1.0) Yes Structure growth parameter

Nuisance log10TAGN 𝒰(7.3, 8.3) Yes Baryon feedback parameter
AIA 𝒩(5.74, CAIA, β) No + red-blue split only Amplitude of intrinsic galaxy alignments for red galaxies
β 𝒩(0.44, CAIA, β) No Slope of the mass scaling of intrinsic galaxy alignments
log10Mi 𝒩(μ, CM) No Mean halo mass of early-type galaxies per tomographic bin i
δz, i 𝒩(μ, Cz) No + red-blue split only Shift of the mean of the redshift distribution per tomographic bin i

Notes. The first two columns provide parameter names and types of the sampling parameters. The third column lists the adopted prior with uniform priors denoted by 𝒰 and Gaussian priors denoted by 𝒩. The fourth column indicates whether or not the parameter is duplicated in the split cosmological analysis. The fifth column provides a brief parameter description. The priors on AIA and β are centred at the mean of the posterior reported by Fortuna et al. (2025) including a correlated prior with correlation coefficient r = −0.59. The prior on Mi is inferred from halo mass measurements as discussed in appendix B in W25. The δz priors are centred at the mean of the shift of the redshift distribution and correlated through a covariance matrix estimated following the methodology of Wright et al. (2025a).

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