Averaged, normalized composite line profiles for all detected vibrational bands that have sufficient signal as described is Sect. 5.3. The composite profiles of different isotopologues and vibrational bands of the same source are presented below each other, the disk classification (group I/II) is noted on the top right. The line profile for HD 101412 is a mix of the ¹³CO v = 1−0 R23 and ¹²CO v = 4–3 R35 lines.