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Table A.1

Nested sampling global log-evidence (log(E)) of various retrievals of the HST/WFC3 data, along with the natural log of the Bayes factor, ln(B01), and σ likelihood against: a flat “base” retrieval (i.e. with no molecular features), a retrieval with only H2O included, and a retrieval with only AlO included.

Molecules included log(E) Clouds? ln(B01) σ
Compared to flat model

H2O 173.2 No 9.5 4.7
H2O 172.9 Yes 9.2 4.6
AlO 175.4 No 12.3 >5
AlO 175.3 Yes 11.6 >5
AlO + H2O 177.4 No 13.7 >5
AlO + H2O 176.7 Yes 13 >5

Compared to H2O-only model

AlO + H2O 177.4 No 4.2 3.4
AlO + H2O 176.7 Yes 3.8 3.2
FeH + H2O 174.1 No 0.9
TiH + H2O 173.5 No 0.3
CH + H2O 173.4 No 0.2
TiO + H2O 173.3 No 0.1
HeH+ + H2O 173.3 No 0.1
H2CO + H2O 173.2 No 0
ScH + H2O 173.2 No 0
K + H2O 173.2 No 0
Na + H2O 173.2 No 0
CO2 + H2O 173.0 No −0.2
NH3 + H2O 172.8 No −0.4
C2H2 + H2O 172.8 No −0.4
HCN + H2O 172.8 No −0.4
OH + H2O 172.8 No −0.4
MgO + H2O 172.8 No −0.4
H2S + H2O 172.7 No −0.6
HNO3 + H2O 172.7 No −0.6
CH4 + H2O 172.6 No −0.6
C2 H4 + H2O 172.5 No −0.7
VO + H2O 172.1 No −1.1

Compared to AlO-only model

AlO + H2O 177.4 No 2.0 2.6
AlO + H2O 176.7 Yes 1.3 2.2

Notes. For reference, the Nested Sampling Global Log-Evidence of the base flat retrieval is 163.7, for the H2O-only retrieval it is 173.2, and for the AlO-only retrieval it is 175.4. The values for σ have been interpolated from Table 2 of Trotta (2008).

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