/usr/share/ncbi/data/KSchoth.flt is in ncbi-data 6.1.20120620-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | ;Chothia aa ; 16 character descriptor
;2 ; 1=Nucleic 2=Protein
1 ; 1=Filter 2-64=No. Pos. in Matrix
8 ; 3-256=Filter Window 0-100=Percent Cutoff Matrix Output
-0.27 A Ala
0.55 BB Asx
-0.23 C Cys Note: Columns 1-8 must contain 1 numeric value only
0.50 D Asp
0.33 E Glu
-0.55 F Phe
-0.22 G Gly
0.37 H His
-0.80 I Ile
1.17 K Lys
-0.44 L Leu
-0.31 M Met
0.61 N Asn
0.36 P Pro
1.00 Q Gln
2.00 R Arg
0.17 S Ser
0.18 T Thr
-0.65 V Val
0.05 W Trp
0.19 X- Unk
0.48 Y Tyr
0.66 ZZ Glx
0.19 ** ***
;Chothia -- dunno -- picked out of a FORTRAN file from Spouge
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