HEALPix Fortran Facility User Guidelines
This document describes the HEALPix Fortran stand-alone facilities
Eric Hivon, Frode K. Hansen, Benjamin D. Wandelt, Krzysztof M. Górski,
Anthony J. Banday, Martin Reinecke
Revision: Version 3.31; August 26, 2016
http://healpix.sf.net
Version 3.31, 2016-08-26