This is the readme for the model associated with the paper:

Rubin JE, Shevtsova NA, Ermentrout GB, Smith JC, Rybak IA (2009)
Multiple rhythmic states in a model of the respiratory central pattern
generator. J Neurophysiol 101:2146-65

This models runs under XPP available from

After downloading and extracting the archive the program can be
started for example under linux by cd'ing to the new folder and typing
xppaut rubinetal_resp_cpg.ode

Click on Initialconds -> Go

When complete click on Window/zoom -> (W)indow and then change "X Hi"
to 10000 and click OK.  Then you should see a graph like:


which is similar to the first trace in Figure 2A from the paper.