Supplementary Materials

Science Advances

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Fig. S1. Averaged ROSINA DFMS mass spectra containing the major krypton isotopes.
Fig. S2. Observation geometry for the noble gas observations in May 2016.
Fig. S3. Observation geometry before perihelion in May 2015 and early June 2015 used to derive the N₂/H₂O ratio.
Fig. S4. N₂ versus H₂O abundances for before perihelion in May 2015 and early June 2015.
Fig. S5. Mix of exotic X-Xe with normal N-Xe compared to 67P/C-G xenon.
Table S1. Krypton average counts per spectrum (~20-s integration time) including errors and below the associated isotopic ratios with respect to ⁸⁴Kr with errors for the three periods.
Table S2. Ratio of ³⁶Ar to total argon, ⁸⁴Kr to total krypton, and ¹³²Xe to total xenon.
Table S3. Bulk abundances of noble gases in the coma of comet 67P/C-G.
Table S4. Measured mass/charge ratios in the dedicated noble gas mode.

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