Fig. 2
From: Rutting vocal display in male impala (Aepyceros melampus) and overlap with alarm context
Measured acoustic variables in male impala rutting roars and snorts. a Roar variables: call duration (dur), the duration of the exhalatory (exh) and inhalatory (inh) phases. b Roar variables on the part from 1.8 s to 2.3 s: fundamental frequency period (period f0), the first four formants (F1-F4). c Snort variables: call duration (dur), peak frequency (fpeak), the interval to the next call within the bout (int), the lower (q25), medium (q50), and upper (q75) quartiles, covering respectively 25, 50 and 75% of the energy of the call spectrum