Clouds and chemistry across the brown dwarf T-Y sequence: Insights from JWST atmospheric retrievals

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Volume 707 (March 2026)

A&A, 707 (2026) A92

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Table B.1

Cloud-free BeAR retrieval outcomes for the curated sample of late-T and Y dwarfs.

Source	SpT	T_eff (K)	log g (cm/s²)	d (pc)	R (R_J)	log₁₀ H₂O	log₁₀ CH₄	log₁₀ CO	log₁₀ CO₂
SDSSJ1624+00	T6	$992_{- 7}^{+ 7}$ $Mathematical equation: $992_{-7}^{+7}$$	${4.89}_{- 0.10}^{+ 0.11}$ $Mathematical equation: $4.89_{-0.10}^{+0.11}$$	${10.89}_{- 0.13}^{+ 0.13}$ $Mathematical equation: $10.89_{-0.13}^{+0.13}$$	${0.80}_{- 0.02}^{+ 0.02}$ $Mathematical equation: $0.80_{-0.02}^{+0.02}$$	$- {3.77}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-3.77_{-0.03}^{+0.03}$$	$- {4.41}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $-4.41_{-0.05}^{+0.05}$$	$- {4.25}_{- 0.08}^{+ 0.08}$ $Mathematical equation: $-4.25_{-0.08}^{+0.08}$$	$- {7.72}_{- 0.09}^{+ 0.08}$ $Mathematical equation: $-7.72_{-0.09}^{+0.08}$$
WISEJ1501-40	T6	$984_{- 7}^{+ 7}$ $Mathematical equation: $984_{-7}^{+7}$$	${4.24}_{- 0.08}^{+ 0.07}$ $Mathematical equation: $4.24_{-0.08}^{+0.07}$$	${13.76}_{- 0.37}^{+ 0.37}$ $Mathematical equation: $13.76_{-0.37}^{+0.37}$$	${0.68}_{- 0.02}^{+ 0.02}$ $Mathematical equation: $0.68_{-0.02}^{+0.02}$$	$- {3.29}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-3.29_{-0.03}^{+0.03}$$	$- {3.72}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-3.72_{-0.04}^{+0.04}$$	$- {3.52}_{- 0.09}^{+ 0.09}$ $Mathematical equation: $-3.52_{-0.09}^{+0.09}$$	$- {6.65}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $-6.65_{-0.06}^{+0.06}$$
SDSSpJ1346-00	T6.5	$932_{- 8}^{+ 8}$ $Mathematical equation: $932_{-8}^{+8}$$	${4.85}_{- 0.12}^{+ 0.12}$ $Mathematical equation: $4.85_{-0.12}^{+0.12}$$	${14.46}_{- 0.41}^{+ 0.42}$ $Mathematical equation: $14.46_{-0.41}^{+0.42}$$	${1.02}_{- 0.03}^{+ 0.04}$ $Mathematical equation: $1.02_{-0.03}^{+0.04}$$	$- {3.62}_{- 0.03}^{+ 0.04}$ $Mathematical equation: $-3.62_{-0.03}^{+0.04}$$	$- {4.35}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $-4.35_{-0.05}^{+0.05}$$	$- {3.44}_{- 0.10}^{+ 0.10}$ $Mathematical equation: $-3.44_{-0.10}^{+0.10}$$	$- {6.77}_{- 0.08}^{+ 0.08}$ $Mathematical equation: $-6.77_{-0.08}^{+0.08}$$
ULASJ1029+09	T8	$733_{- 10}^{+ 11}$ $Mathematical equation: $733_{-10}^{+11}$$	${4.55}_{- 0.48}^{+ 0.06}$ $Mathematical equation: $4.55_{-0.48}^{+0.06}$$	${14.60}_{- 0.32}^{+ 0.31}$ $Mathematical equation: $14.60_{-0.32}^{+0.31}$$	${0.90}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $0.90_{-0.03}^{+0.03}$$	$- {3.31}_{- 0.09}^{+ 0.04}$ $Mathematical equation: $-3.31_{-0.09}^{+0.04}$$	$- {4.11}_{- 0.25}^{+ 0.05}$ $Mathematical equation: $-4.11_{-0.25}^{+0.05}$$	$- {3.61}_{- 0.18}^{+ 0.10}$ $Mathematical equation: $-3.61_{-0.18}^{+0.10}$$	$- {7.24}_{- 0.15}^{+ 0.10}$ $Mathematical equation: $-7.24_{-0.15}^{+0.10}$$
WISEJ0247+37	T8	$683_{- 3}^{+ 3}$ $Mathematical equation: $683_{-3}^{+3}$$	${4.66}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $4.66_{-0.06}^{+0.06}$$	${15.45}_{- 0.36}^{+ 0.36}$ $Mathematical equation: $15.45_{-0.36}^{+0.36}$$	${0.82}_{- 0.02}^{+ 0.02}$ $Mathematical equation: $0.82_{-0.02}^{+0.02}$$	$- {3.32}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-3.32_{-0.03}^{+0.03}$$	$- {4.13}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-4.13_{-0.03}^{+0.03}$$	$- {4.87}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-4.87_{-0.04}^{+0.04}$$	$- {8.44}_{- 0.08}^{+ 0.07}$ $Mathematical equation: $-8.44_{-0.08}^{+0.07}$$
WISEJ0430+46	T8	$571_{- 1}^{+ 1}$ $Mathematical equation: $571_{-1}^{+1}$$	${4.92}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $4.92_{-0.05}^{+0.05}$$	${10.42}_{- 0.26}^{+ 0.27}$ $Mathematical equation: $10.42_{-0.26}^{+0.27}$$	${0.75}_{- 0.02}^{+ 0.02}$ $Mathematical equation: $0.75_{-0.02}^{+0.02}$$	$- {3.34}_{- 0.02}^{+ 0.02}$ $Mathematical equation: $-3.34_{-0.02}^{+0.02}$$	$- {3.70}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-3.70_{-0.03}^{+0.03}$$	$- {5.59}_{- 0.02}^{+ 0.02}$ $Mathematical equation: $-5.59_{-0.02}^{+0.02}$$	$- {8.50}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $-8.50_{-0.06}^{+0.06}$$
WISEPAJ1959-33	T8	$736_{- 6}^{+ 6}$ $Mathematical equation: $736_{-6}^{+6}$$	${4.06}_{- 0.04}^{+ 0.07}$ $Mathematical equation: $4.06_{-0.04}^{+0.07}$$	${11.93}_{- 0.25}^{+ 0.25}$ $Mathematical equation: $11.93_{-0.25}^{+0.25}$$	${0.99}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $0.99_{-0.03}^{+0.03}$$	$- {3.44}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-3.44_{-0.03}^{+0.03}$$	$- {4.31}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-4.31_{-0.03}^{+0.03}$$	$- {3.93}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $-3.93_{-0.06}^{+0.06}$$	$- {7.58}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $-7.58_{-0.06}^{+0.06}$$
WISEPAJ0313+78	T8.5	$589_{- 3}^{+ 2}$ $Mathematical equation: $589_{-3}^{+2}$$	${5.49}_{- 0.01}^{+ 0.01}$ $Mathematical equation: $5.49_{-0.01}^{+0.01}$$	${7.37}_{- 0.14}^{+ 0.14}$ $Mathematical equation: $7.37_{-0.14}^{+0.14}$$	${0.88}_{- 0.02}^{+ 0.02}$ $Mathematical equation: $0.88_{-0.02}^{+0.02}$$	$- {2.78}_{- 0.02}^{+ 0.01}$ $Mathematical equation: $-2.78_{-0.02}^{+0.01}$$	$- {2.80}_{- 0.01}^{+ 0.01}$ $Mathematical equation: $-2.80_{-0.01}^{+0.01}$$	$- {4.51}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-4.51_{-0.03}^{+0.03}$$	$- {7.28}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-7.28_{-0.04}^{+0.04}$$
WISEAJ2159-48	T9	$574_{- 1}^{+ 1}$ $Mathematical equation: $574_{-1}^{+1}$$	${5.46}_{- 0.06}^{+ 0.03}$ $Mathematical equation: $5.46_{-0.06}^{+0.03}$$	${13.57}_{- 0.42}^{+ 0.42}$ $Mathematical equation: $13.57_{-0.42}^{+0.42}$$	${0.85}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $0.85_{-0.03}^{+0.03}$$	$- {2.98}_{- 0.03}^{+ 0.02}$ $Mathematical equation: $-2.98_{-0.03}^{+0.02}$$	$- {3.15}_{- 0.03}^{+ 0.02}$ $Mathematical equation: $-3.15_{-0.03}^{+0.02}$$	$- {5.31}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-5.31_{-0.03}^{+0.03}$$	$- {8.26}_{- 0.09}^{+ 0.08}$ $Mathematical equation: $-8.26_{-0.09}^{+0.08}$$
WISEJ2102-44	T9	$597_{- 3}^{+ 4}$ $Mathematical equation: $597_{-3}^{+4}$$	${5.49}_{- 0.01}^{+ 0.01}$ $Mathematical equation: $5.49_{-0.01}^{+0.01}$$	${10.76}_{- 0.19}^{+ 0.19}$ $Mathematical equation: $10.76_{-0.19}^{+0.19}$$	${0.83}_{- 0.02}^{+ 0.02}$ $Mathematical equation: $0.83_{-0.02}^{+0.02}$$	$- {2.79}_{- 0.02}^{+ 0.02}$ $Mathematical equation: $-2.79_{-0.02}^{+0.02}$$	$- {2.76}_{- 0.01}^{+ 0.01}$ $Mathematical equation: $-2.76_{-0.01}^{+0.01}$$	$- {4.28}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-4.28_{-0.03}^{+0.03}$$	$- {7.11}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-7.11_{-0.04}^{+0.04}$$
WISEJ2209+27	Y0	$353_{- 2}^{+ 2}$ $Mathematical equation: $353_{-2}^{+2}$$	${4.45}_{- 0.08}^{+ 0.08}$ $Mathematical equation: $4.45_{-0.08}^{+0.08}$$	${6.18}_{- 0.07}^{+ 0.07}$ $Mathematical equation: $6.18_{-0.07}^{+0.07}$$	${1.03}_{- 0.02}^{+ 0.02}$ $Mathematical equation: $1.03_{-0.02}^{+0.02}$$	$- {3.16}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-3.16_{-0.04}^{+0.04}$$	$- {3.15}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-3.15_{-0.04}^{+0.04}$$	$- {4.91}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-4.91_{-0.04}^{+0.04}$$	$- {7.98}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $-7.98_{-0.05}^{+0.05}$$
WISEJ0359-54	Y0	$463_{- 2}^{+ 2}$ $Mathematical equation: $463_{-2}^{+2}$$	${4.80}_{- 0.07}^{+ 0.07}$ $Mathematical equation: $4.80_{-0.07}^{+0.07}$$	${13.60}_{- 0.33}^{+ 0.33}$ $Mathematical equation: $13.60_{-0.33}^{+0.33}$$	${0.93}_{- 0.02}^{+ 0.03}$ $Mathematical equation: $0.93_{-0.02}^{+0.03}$$	$- {3.14}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-3.14_{-0.04}^{+0.04}$$	$- {3.31}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-3.31_{-0.04}^{+0.04}$$	$- {4.86}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-4.86_{-0.04}^{+0.04}$$	$- {8.15}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $-8.15_{-0.06}^{+0.06}$$
WISEJ0734-71	Y0	$480_{- 2}^{+ 2}$ $Mathematical equation: $480_{-2}^{+2}$$	${5.10}_{- 0.07}^{+ 0.05}$ $Mathematical equation: $5.10_{-0.07}^{+0.05}$$	${13.44}_{- 0.29}^{+ 0.29}$ $Mathematical equation: $13.44_{-0.29}^{+0.29}$$	${0.94}_{- 0.02}^{+ 0.02}$ $Mathematical equation: $0.94_{-0.02}^{+0.02}$$	$- {2.89}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-2.89_{-0.03}^{+0.03}$$	$- {2.94}_{- 0.04}^{+ 0.03}$ $Mathematical equation: $-2.94_{-0.04}^{+0.03}$$	$- {4.59}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-4.59_{-0.03}^{+0.03}$$	$- {7.68}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $-7.68_{-0.05}^{+0.05}$$
WISEJ1206+84	Y0	$451_{- 2}^{+ 2}$ $Mathematical equation: $451_{-2}^{+2}$$	${5.04}_{- 0.07}^{+ 0.06}$ $Mathematical equation: $5.04_{-0.07}^{+0.06}$$	${11.82}_{- 0.27}^{+ 0.27}$ $Mathematical equation: $11.82_{-0.27}^{+0.27}$$	${1.10}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $1.10_{-0.03}^{+0.03}$$	$- {2.70}_{- 0.04}^{+ 0.05}$ $Mathematical equation: $-2.70_{-0.04}^{+0.05}$$	$- {2.81}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-2.81_{-0.04}^{+0.04}$$	$- {3.51}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $-3.51_{-0.05}^{+0.05}$$	$- {6.82}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $-6.82_{-0.05}^{+0.05}$$
WISEPCJ2056+14	Y0	$459_{- 2}^{+ 2}$ $Mathematical equation: $459_{-2}^{+2}$$	${5.04}_{- 0.12}^{+ 0.08}$ $Mathematical equation: $5.04_{-0.12}^{+0.08}$$	${7.10}_{- 0.10}^{+ 0.10}$ $Mathematical equation: $7.10_{-0.10}^{+0.10}$$	${1.09}_{- 0.02}^{+ 0.02}$ $Mathematical equation: $1.09_{-0.02}^{+0.02}$$	$- {2.79}_{- 0.06}^{+ 0.05}$ $Mathematical equation: $-2.79_{-0.06}^{+0.05}$$	$- {2.85}_{- 0.07}^{+ 0.05}$ $Mathematical equation: $-2.85_{-0.07}^{+0.05}$$	$- {4.00}_{- 0.06}^{+ 0.05}$ $Mathematical equation: $-4.00_{-0.06}^{+0.05}$$	$- {7.29}_{- 0.08}^{+ 0.06}$ $Mathematical equation: $-7.29_{-0.08}^{+0.06}$$
WISEJ0825+28	Y0.5	$379_{- 6}^{+ 35}$ $Mathematical equation: $379_{-6}^{+35}$$	${4.32}_{- 0.09}^{+ 0.09}$ $Mathematical equation: $4.32_{-0.09}^{+0.09}$$	${6.55}_{- 0.08}^{+ 0.08}$ $Mathematical equation: $6.55_{-0.08}^{+0.08}$$	${1.07}_{- 0.02}^{+ 0.02}$ $Mathematical equation: $1.07_{-0.02}^{+0.02}$$	$- {3.15}_{- 0.03}^{+ 0.04}$ $Mathematical equation: $-3.15_{-0.03}^{+0.04}$$	$- {3.26}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-3.26_{-0.04}^{+0.04}$$	$- {5.18}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-5.18_{-0.04}^{+0.04}$$	$- {8.33}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $-8.33_{-0.06}^{+0.06}$$
WISEPCJ1405+55	Y0.5	$399_{- 3}^{+ 5}$ $Mathematical equation: $399_{-3}^{+5}$$	${4.67}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $4.67_{-0.06}^{+0.06}$$	${6.33}_{- 0.09}^{+ 0.09}$ $Mathematical equation: $6.33_{-0.09}^{+0.09}$$	${0.98}_{- 0.02}^{+ 0.02}$ $Mathematical equation: $0.98_{-0.02}^{+0.02}$$	$- {3.21}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-3.21_{-0.03}^{+0.03}$$	$- {3.27}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-3.27_{-0.04}^{+0.04}$$	$- {5.59}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-5.59_{-0.04}^{+0.04}$$	$- {8.61}_{- 0.07}^{+ 0.06}$ $Mathematical equation: $-8.61_{-0.07}^{+0.06}$$
WISEJ0535-75	Y1	$400_{- 2}^{+ 3}$ $Mathematical equation: $400_{-2}^{+3}$$	${4.27}_{- 0.09}^{+ 0.09}$ $Mathematical equation: $4.27_{-0.09}^{+0.09}$$	${13.78}_{- 0.22}^{+ 0.21}$ $Mathematical equation: $13.78_{-0.22}^{+0.21}$$	${1.40}_{- 0.02}^{+ 0.01}$ $Mathematical equation: $1.40_{-0.02}^{+0.01}$$	$- {3.33}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-3.33_{-0.03}^{+0.03}$$	$- {3.54}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-3.54_{-0.04}^{+0.04}$$	$- {5.96}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-5.96_{-0.04}^{+0.04}$$	$- {9.08}_{- 0.11}^{+ 0.10}$ $Mathematical equation: $-9.08_{-0.11}^{+0.10}$$
WISEPAJ1541-22	Y1	$399_{- 2}^{+ 2}$ $Mathematical equation: $399_{-2}^{+2}$$	${4.71}_{- 0.12}^{+ 0.12}$ $Mathematical equation: $4.71_{-0.12}^{+0.12}$$	${5.99}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $5.99_{-0.06}^{+0.06}$$	${1.05}_{- 0.02}^{+ 0.02}$ $Mathematical equation: $1.05_{-0.02}^{+0.02}$$	$- {2.98}_{- 0.05}^{+ 0.06}$ $Mathematical equation: $-2.98_{-0.05}^{+0.06}$$	$- {2.99}_{- 0.08}^{+ 0.08}$ $Mathematical equation: $-2.99_{-0.08}^{+0.08}$$	$- {4.85}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $-4.85_{-0.06}^{+0.06}$$	$- {7.80}_{- 0.07}^{+ 0.08}$ $Mathematical equation: $-7.80_{-0.07}^{+0.08}$$
CWISEPJ1047+54	Y1	$430_{- 7}^{+ 6}$ $Mathematical equation: $430_{-7}^{+6}$$	${5.06}_{- 0.07}^{+ 0.06}$ $Mathematical equation: $5.06_{-0.07}^{+0.06}$$	${14.82}_{- 0.92}^{+ 0.86}$ $Mathematical equation: $14.82_{-0.92}^{+0.86}$$	${0.94}_{- 0.06}^{+ 0.05}$ $Mathematical equation: $0.94_{-0.06}^{+0.05}$$	$- {2.56}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $-2.56_{-0.05}^{+0.05}$$	$- {2.69}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $-2.69_{-0.05}^{+0.05}$$	$- {3.79}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $-3.79_{-0.05}^{+0.05}$$	$- {6.67}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $-6.67_{-0.05}^{+0.05}$$
WISEAJ2354+02	Y1	$382_{- 4}^{+ 5}$ $Mathematical equation: $382_{-4}^{+5}$$	${4.76}_{- 0.07}^{+ 0.07}$ $Mathematical equation: $4.76_{-0.07}^{+0.07}$$	${7.66}_{- 0.17}^{+ 0.18}$ $Mathematical equation: $7.66_{-0.17}^{+0.18}$$	${0.86}_{- 0.02}^{+ 0.02}$ $Mathematical equation: $0.86_{-0.02}^{+0.02}$$	$- {3.00}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-3.00_{-0.03}^{+0.03}$$	$- {3.10}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-3.10_{-0.04}^{+0.04}$$	$- {5.27}_{- 0.04}^{+ 0.03}$ $Mathematical equation: $-5.27_{-0.04}^{+0.03}$$	$- {8.06}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $-8.06_{-0.05}^{+0.05}$$
CWISEPJ1446-23	Y1	$372_{- 4}^{+ 5}$ $Mathematical equation: $372_{-4}^{+5}$$	${4.87}_{- 0.11}^{+ 0.10}$ $Mathematical equation: $4.87_{-0.11}^{+0.10}$$	${9.67}_{- 0.41}^{+ 0.41}$ $Mathematical equation: $9.67_{-0.41}^{+0.41}$$	${0.91}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $0.91_{-0.04}^{+0.04}$$	$- {2.78}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $-2.78_{-0.06}^{+0.06}$$	$- {2.71}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $-2.71_{-0.06}^{+0.06}$$	$- {4.48}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $-4.48_{-0.06}^{+0.06}$$	$- {7.27}_{- 0.07}^{+ 0.07}$ $Mathematical equation: $-7.27_{-0.07}^{+0.07}$$

Notes. Listed are the following parameters: Spectral type (SpT), effective temperature (T_eff), surface gravity (log g), distance to the object (d), its radius (R), and molecular volume mixing ratios for water (log₁₀ H₂O), methane (log₁₀ CH₄), carbon monoxide (log₁₀ CO), and carbon dioxide (log₁₀ CO₂).

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