<p>Example model space.</p>

Each model subspace has an ID and an associated superset PEtab problem, which includes the mathematical model. This superset problem is customized into single models according to the remaining columns, which contain semicolon-delimited lists of values that parameters (column headers) can take in the subspace.

The next subfigures represent models as graphs. Nodes (colored circles) are variables (e.g., biochemical species), and arrows are processes, e.g., conversion (• •), import (, or export () of the variables. The arrows are annotated with their associated parameters, e.g., k_4 is the rate constant associated with export of variables <i>A</i> and <i>B</i> due to an interaction between <i>A</i> and <b><i>B</i>.