Fig.3.

Computed cardiac-response functions for subjects #1 to #6 using the algorithm from Fig.1. The cardiac response function was parameterized as $h_C\left(t\right)=h_C^{\left(0\right)}\left(t\right)+\alpha \frac{d}{dt}{h}_C^{\left(0\right)}\left(t\right)$ where $h_C^{\left(0\right)}\left(t\right)=a_1{t}^{a_2}{e}^{-\frac{t}{a_3}}-a_4{e}^{-\frac{1}{a_5}{(t-a_6)}^2}$.