Results of a Hessian analysis of the toy model of the sky T353 with instrumental noise. The black (red) squares represent the 3σ level of the distribution of −λ−(T353) (−λ−(D353)) within bins of computed with the mask used in our data analysis. The dashed lines represent the analytical fits in Eq. (A.2) (black dashed line) and Eq. (A.3) (red dashed line).
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