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/usr/share/texmf/fonts/afm/arphic/gkaiu/gkaiu23.afm is in latex-cjk-chinese-arphic-gkai00mp 1.23.

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StartFontMetrics 2.0
Comment Generated by FontForge 20120731
Comment Creation Date: Sat Jul  6 01:15:05 2013
FontName gkaiu23
FullName AR PL KaitiM GB 23
FamilyName AR PL KaitiM GB
Weight Book
Notice ((c) Copyright 1994-1999, Arphic Technology Co., Ltd.)
Comment 
Comment Subfont version 2013-07-05.
ItalicAngle 0
IsFixedPitch true
UnderlinePosition -47.8516
UnderlineThickness 48.8281
Version 2.11
EncodingScheme FontSpecific
FontBBox 0 -121 1000 879
StartCharMetrics 1
C 18 ; WX 1000 ; WY 1000 ; N uni2312 ; B 113 215 887 575 ;
EndCharMetrics
EndFontMetrics