Before revision:  Availability and Implementation: Specifications of PEtab, the PEtab Python library, as well as links to examples, and all supporting software  are available at URL a snapshot is available at URL All original content is available under permissive licenses.
After revision:  Specifications of PEtab, the PEtab Python library, as well as links to examples, and all supporting software are available at URL a snapshot is available at URL All original content is available under permissive licenses.