Statistics and model parameters for the dolphins’ acoustic behavior (see equation 1).

SE is residual standard error of the mixed-effect model. During the 5-day session, both dolphins demonstrate a 24 hr diel cycle (λ) and a negative slope (m).SE 即混合效应模型（mixed-effect model）的残差标准误（residual standard error）。在为期5天的观测时段内，两头海豚均表现出24小时昼夜节律（λ）与负斜率（m）。