Rotational multiplets identified in PG 0101+039 by the common frequency spacing. All the components, labeled by vertical segments, are shifted to the frequencies as given in the text. The value of splitting is given in the text and indicated by the annotation of double arrows between the segments, whereas two types of arrow lines indicate the different interpretations of rotation multiplets (see text for details). The blue horizontal lines are the 5.2σ detection threshold. (a)–(e) Different degree ℓ multiplets in g-mode region, (f) suspected high degree multiplets with ℓ ≥ 8 in g-mode region, (g) mixed mode region to be identified of p-modes and (h) p-mode region.