/usr/share/php/maps/iso-8859-16.map is in php-font-lib 0.3.1+dfsg-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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!01 U+0001 .notdef
!02 U+0002 .notdef
!03 U+0003 .notdef
!04 U+0004 .notdef
!05 U+0005 .notdef
!06 U+0006 .notdef
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!11 U+0011 .notdef
!12 U+0012 .notdef
!13 U+0013 .notdef
!14 U+0014 .notdef
!15 U+0015 .notdef
!16 U+0016 .notdef
!17 U+0017 .notdef
!18 U+0018 .notdef
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!23 U+0023 numbersign
!24 U+0024 dollar
!25 U+0025 percent
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!27 U+0027 quotesingle
!28 U+0028 parenleft
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!35 U+0035 five
!36 U+0036 six
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!42 U+0042 B
!43 U+0043 C
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!45 U+0045 E
!46 U+0046 F
!47 U+0047 G
!48 U+0048 H
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!4F U+004F O
!50 U+0050 P
!51 U+0051 Q
!52 U+0052 R
!53 U+0053 S
!54 U+0054 T
!55 U+0055 U
!56 U+0056 V
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!58 U+0058 X
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!62 U+0062 b
!63 U+0063 c
!64 U+0064 d
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!82 U+0082 .notdef
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!9D U+009D .notdef
!9E U+009E .notdef
!9F U+009F .notdef
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!A1 U+0104 Aogonek
!A2 U+0105 aogonek
!A3 U+0141 Lslash
!A4 U+20AC Euro
!A5 U+201E quotedblbase
!A6 U+0160 Scaron
!A7 U+00A7 section
!A8 U+0161 scaron
!A9 U+00A9 copyright
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!AD U+00AD hyphen
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!B0 U+00B0 degree
!B1 U+00B1 plusminus
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!D3 U+00D3 Oacute
!D4 U+00D4 Ocircumflex
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!D6 U+00D6 Odieresis
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!D8 U+0170 Uhungarumlaut
!D9 U+00D9 Ugrave
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!DE U+021A Tcommaaccent
!DF U+00DF germandbls
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!E1 U+00E1 aacute
!E2 U+00E2 acircumflex
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!F2 U+00F2 ograve
!F3 U+00F3 oacute
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!F5 U+0151 ohungarumlaut
!F6 U+00F6 odieresis
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!FB U+00FB ucircumflex
!FC U+00FC udieresis
!FD U+0119 eogonek
!FE U+021B tcommaaccent
!FF U+00FF ydieresis
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