Retrieved abundance profiles of propadiene (panel A) and propyne (panel B) studied in this Letter. Error bars are indicated at the peak of the contribution function. If we assume that propadiene has a positive vertical gradient, then our measurement is sensitive to a higher altitude than if we assume a vertically uniform profile, which is shown in panel C. Photochemical model predictions from Vuitton et al. (2019) and Li et al. (2015) are labeled V19 and L15, respectively. L19 indicates measurements from Lombardo et al. (2019a) described in the text.