Figure 19: -parameterization. Left panel: 1 and 2 marginalized probability regions for the
parameters and in Eq. (1.8.6) relative to the reference case (shaded blue regions), to the
optimistic case (yellow long-dashed ellipses) and to the pessimistic case (black short-dashed ellipses).
The red dot marks the fiducial model while the square represents the coupling model. Right panel:
present constraints on and computed through a full likelihood method (here the red dot
marks the likelihood peak) [307].
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