FIG. 4 in A New, Morphologically Cryptic Species of Fanged Frog, Genus Limnonectes (Amphibia: Anura: Dicroglossidae), from Mindoro Island, Central Philippines

FIG. 4. Oscillograms and spectrograms of advertisement calls of Limnonectes cf. acanthi from Mindoro (A–C) and L. acanthi from Palawan (D–F). (A) Oscillogram of the entire advertisement call of L. cf. acanthi from Mindoro; (B) a close-up showing two consecutive notes. (C) A spectrogram showing the dominant frequency of the entire call. (D) Oscillogram of the advertisement call of L. acanthi from Palawan; (E) a close-up of two consecutive notes showing the two-pulse nature of each note. (F) Spectrogram showing the dominant frequency of the Palawan advertisement call.