The hardware used in the computational studies is part of the
UMBC High Performance Computing Facility (HPCF).
The facility is supported by the U.S. National Science Foundation
through the MRI program (grant nos.~CNS--0821258 and CNS--1228778)
and the SCREMS program (grant no.~DMS--0821311),
with additional substantial support from the
University of Maryland, Baltimore County (UMBC).
See \url{hpcf.umbc.edu}
for more information on HPCF and the projects using its resources.

