Here is a list of all namespaces with brief descriptions:

[detail level 123]

▼NEdbEDAUtil
NROOTDict
▼NFile
NFormat
NInfo
NSection
NGRAINS_TREE
▼NHeader
NCenter
NExtents
NIdentifier
NTransform
▼NMATRIX
NROOTDict
CCMatrix
▼CVtMatrix
CVtMatrix_row
CVtMatrix_row_const
CVtNegMatrix
CVtSqMatrix
CVtSymMatrix
CVtVector
NMIPBaseTrack
NMIPEmulsionTrack
NPb_CONST
NROOT
NSHOWER_PAR
Nstd
NTrackIndexEntry
NTRACKING_PAR
▼NVERTEX
NROOTDict
CConstRelationIterator
CConstReverseRelationIterator
CKalman
CMassC
CRelation
CRelationIterator
CRelationList
CReverseRelationIterator
CTrack
CVertex
▼CVtIni
Cinitializer	Not available in CINT
NVERTEX_PAR
NView