Science Advances

This PDF file includes:

• Fig. S1. Time variation of major and minor volatile species from ROSINA/DFMS on 18 September 2014.
  
• Fig. S2. Time variation of major and minor volatile species from ROSINA/DFMS on 29 September 2014.
  
• Fig. S3. Time variation of major and minor volatile species from ROSINA/DFMS on 11 October 2014.
  
• Fig. S4. Equilibrium curves in the PSN for various known comets.
  
• Table S1. Fitting parameters used in calculating clathrate equilibrium curves of CH₄ and C₂H₆.
  
• Table S2. Fitting coefficients used to calculate condensation curves.
  
• Table S3. Fitting coefficients for the condensation pressure of crystalline H₂O ice.
  
• References (42, 43)

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