Fig. 4 in A systematic review of the Pulchrana picturata complex, with the description of a new species from Peninsular Malaysia, Sumatra, and southern Thailand

Fig. 4. Audio spectrograms and corresponding oscillograms for the sympatric species pairs Pulchrana sundabarat, new species, and P. banjarana in Peninsular Malaysia; P. signata and P. picturata in Borneo. Upper call envelopes of P. sundabarat, new species, and P. picturata graphically represented as purple lines.