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80 ± 3.2% hydrogen (H2) 19 ± 3.2% helium (He) 1.5 ± 0.5% methane (CH4) ~% hydrogen deuteride (HD) ~% ethane (C2H6) Ices: ammonia (NH3) water (H2O) ammonium hydrosulfide (NH4SH) methane ice (?) (CH4•)