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Table 3:

Statistical errors $\sigma _{\rm stat}$ and residual biases $b_{\rm sys}$ for the different survey models used.
Survey Parameter $\gamma$ varied $\gamma$ fixed
    $\sigma _{\rm stat}$ $b_{\rm sys}$ $\sigma _{\rm stat}$ $b_{\rm sys}$
S A 2.885 -0.009 0.827 -0.004
  $\gamma$ 7.356 0.012    
P1 A 0.712 -0.081 0.172 -0.046
  $\gamma$ 1.776 0.090    
P2 A 0.697 -0.181 0.272 -0.171
  $\gamma$ 2.017 0.031    

Notes. The left column shows marginalised $1\sigma $ errors on the amplitude A of the GI signal and on $\gamma$, quantifying an additional redshift dependence. In the right column results obtained for only varying A are listed.


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