/usr/share/ncarg/nclex/ngmath/ is in libncarg-data 6.1.2-7.
This file is owned by root:root, with mode 0o755.
..
/usr/share/ncarg/nclex/ngmath/nm01n.ncl
/usr/share/ncarg/nclex/ngmath/nm02n.ncl
/usr/share/ncarg/nclex/ngmath/nm03n.ncl
/usr/share/ncarg/nclex/ngmath/nm04n.ncl
/usr/share/ncarg/nclex/ngmath/nm05n.ncl
/usr/share/ncarg/nclex/ngmath/nm06n.ncl
/usr/share/ncarg/nclex/ngmath/nm07n.ncl
/usr/share/ncarg/nclex/ngmath/nm08n.ncl
/usr/share/ncarg/nclex/ngmath/nm09n.ncl
/usr/share/ncarg/nclex/ngmath/nm10n.ncl
/usr/share/ncarg/nclex/ngmath/nm11n.ncl
/usr/share/ncarg/nclex/ngmath/nm12n.ncl
/usr/share/ncarg/nclex/ngmath/nm13n.ncl
/usr/share/ncarg/nclex/ngmath/nm14n.ncl
/usr/share/ncarg/nclex/ngmath/nm15n.ncl
/usr/share/ncarg/nclex/ngmath/nm16n.ncl
/usr/share/ncarg/nclex/ngmath/nm17n.ncl
/usr/share/ncarg/nclex/ngmath/nm18n.ncl
/usr/share/ncarg/nclex/ngmath/nm19n.ncl
/usr/share/ncarg/nclex/ngmath/nm20n.ncl
/usr/share/ncarg/nclex/ngmath/nm21n.ncl
/usr/share/ncarg/nclex/ngmath/nm22n.ncl