a command like
(depends on your platform):

xppaut OneCellTwoOsc.ode

Once XPP starts select Initalconds -> (G)o to see an figure like this:

<img src="./screenshot.png" alt="screenshot">

Inside XPP, use File -> Read set with the included set files to get
certain dynamics from the paper:

OneCellTwoOsc.ode.setsb <-> the paper's Fig. 2a,
<img src="./fig2a.png" alt="fig 2a">

OneCellTwoOsc.ode.setdb <-> the paper's Fig. 2b,
<img src="./fig2b.png" alt="fig 2b">

OneCellTwoOsc.ode.setsdb <-> the paper's Fig. 2