Ratios of the N₂ fractions desorbing in different desorption regimes. Top row: ratio of the N₂ desorption during the combined H₂O release to the sum of the CO₂ and pure N₂ (co-)desorption. The expected ratio of 1.72 for 67P has been indicated (purple, dashed line), as well as the upper limit estimate of 3 (purple, shaded region). Bottom row: ratio of the N₂ desorption during the combined H₂O release to the N₂ co-desorption with CO₂. The expected ratio for 67P has been indicated and includes the area between 1.72 (purple, dashed line) and to about 3 (purple, shaded region).