Figure 2.

The cross-sectional area ($A_{\mathrm{a}}$) of the channel for airflow and the corresponding perimeter (${\gamma }_{\mathrm{a}}$) for the Arctic (Eb) and the subtropical (Mm) seals, as computed from CT data. Both variables are plotted as a function of scaled position, $z^{\ast }=z/L$, where L is the length of the MT region. Here, $z^{\ast }=0$ and $z^{\ast }=1$ refer to the distal (the nostrils) and proximal ends of the MT region, respectively. To see this figure in color, go online.