Please see the Allen SDK pages (LINKS TODO) on perisomatic biophysical models and generalized leaky integrate-and-fire models for details showing how to download these files in the context of neuronal model simulation.
A standard set of electrophysiological features are automatically computed from the recorded responses of each cell. A subset of those features are displayed at the top of the electrophysiology page for a cell. Please see the electrophysiology technical white paper (TODO) for a list of computed features and their interpretations.
Use this query to download the features computed for Scnn1a cell specimen 467703703:
http://api.brain-map.org/api/v2/data/query.xml? criteria=model::EphysFeature ,rma::criteria,[specimen_id$eq467703703]