Comparison of C/2023 H2 with other comets. In the upper panel, C/2023 H2 is compared with C/2009P1, C/1999T1, and C/2013 R1, which show the closest relative abundance proportions. In the bottom plot, for each molecular species, we compare C/2023 H2 (marked with a magenta star) with the box plot statistic from other infrared results relative to comets observed within 2 au from the Sun (data are from Lippi et al. 2021 and references therein). For each box the middle line corresponds to the median, the box limits to the 25^th and 75^th percentiles, and the whiskers to the 5^th and 95^th percentiles. C/2009P1, C/1999T1, and C/2013 R1 are also shown with a grey square, diamond, and triangle, respectively.