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Table D.1

Summary of the parameters used in the retrievals, their expected values, and their prior distributions.

Parameter Description Priors Input values
a4 P–T Parameter (Degree 4) 𝒰(0, 10) 1.674
a3 P–T Parameter (Degree 3) 𝒰(0, 100) 23.120
a2 P–T Parameter (Degree 2) 𝒰(0, 500) 99.703
a1 P–T Parameter (Degree 1) 𝒰(0, 500) 146.626
a0 P–T Parameter (Degree 0) 𝒰(0, 1000) 285.218
log10 (P0 [bar]) Surface Pressure 𝒰(−4, 3) 0.006
Rpl [R] Planet Radius (bulk value) 𝒰(0.5, 2) 1.000
Mpl [M]) Planet Mass (bulk value) 𝒢(1.0, 0.5) 1.000
log10(N2) N2 Mass Fraction 𝒰(−15, 0) −0.103
log10(O2) O2 Mass Fraction 𝒰(−15, 0) −0.679
log10(H2O) H2O Mass Fraction 𝒰(−15, 0) −3.000
log10(CO2) CO2 Mass Fraction 𝒰(−15, 0) −3.387
log10(CH4) CH4 Mass Fraction 𝒰(−15, 0) −5.770
log10(O3) O3 Mass Fraction 𝒰(−15, 0) −6.523
log10(CO) CO Mass Fraction 𝒰(−15, 0) −6.903
log10(N2O) N2O Mass Fraction 𝒰(−15, 0) −6.495
rs Surface Reflectance 𝒰(0, 1) 0.1

Notes. 𝒰(x, y) denotes a boxcar prior with a lower threshold x and upper threshold y; 𝒢(μ, σ) represents a Gaussian prior with mean μ and standard deviation σ).

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