Equivalent-width detection threshold of C₆₀ in the 6070 Å region for the eight LOSs in the program. Each panel and the spectrum it presents are labeled with the identifier of the target star. The position of the γ₀ band of C₆₀ is indicated through all panels (vertical dotted line). In all panels, a zero threshold is drawn to serve as a guide to the eye (horizontal dashed line). Positions of DIBs according to Hobbs et al. (2009) are indicated in the bottom panel (short vertical lines).