    New chain ID            Original chain ID

8fld-pdb-bundle1.pdb:
           A                        BE
           B                        L1
           C                        L2
           D                        L3
           E                        L4
           F                        L5
           G                        L6
           H                        L7
           I                        L8
           J                        L9
           K                        LA
           L                        LB
           M                        LC
           N                        LD
           O                        LE
           P                        LF
           Q                        LG
           R                        LH
           S                        LI

8fld-pdb-bundle2.pdb:
           A                        LJ
           B                        LK
           C                        LL
           D                        LM
           E                        LN
           F                        LO
           G                        LP
           H                        LQ
           I                        LR
           J                        LS
           K                        LT
           L                        LU
           M                        LV
           N                        LW
           O                        LX
           P                        LY
           Q                        LZ
           R                        NK
           S                        NL
           T                        NP
           U                        SA
           V                        SB
           W                        SC
           X                        SD
           Y                        SE
           Z                        SF
           a                        SG
           b                        SH
           c                        SI
           d                        SK
           e                        SL
           f                        SM
           g                        SQ
           h                        SR
           i                        SV
