****************************************************************************
File name: 1xi1.pdb
    no. of DNA/RNA chains: 2 [C=3,D=3]
    no. of nucleotides:    6
    no. of atoms:          9693
    no. of waters:         235
    no. of metals:         2 [Mg=2]

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List of 4 base stacks
  Note: A stack is an ordered list of nucleotides assembled together via
        base-stacking interactions, regardless of backbone connectivity.
        Stacking interactions within a stem are *not* included.
   1 nts=2 TT C.DT3,C.DT4
   2 nts=2 TY C.DT5,A.TYR148
   3 nts=2 TT D.DT3,D.DT4
   4 nts=2 TY D.DT5,B.TYR148

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List of 2 non-loop single-stranded segments
   1 nts=3 TTT C.DT3,C.DT4,C.DT5
   2 nts=3 TTT D.DT3,D.DT4,D.DT5

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Secondary structures in dot-bracket notation (dbn) as a whole and per chain
>1xi1 nts=6 [whole]
TTT&TTT
...&...
>1xi1-C #1 nts=3 4.60(0.22) [chain] DNA
TTT
...
>1xi1-D #2 nts=3 3.14(0.24) [chain] DNA
TTT
...

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Summary of structural features of 6 nucleotides
  Note: the first five columns are: (1) serial number, (2) one-letter
    shorthand name, (3) dbn, (4) id string, (5) rmsd (~zero) of base
    ring atoms fitted against those in a standard base reference
    frame. The sixth (last) column contains a comma-separated list of
    features whose meanings are mostly self-explanatory, except for:
      turn: angle C1'(i-1)--C1'(i)--C1'(i+1) < 90 degrees
      break: no backbone linkage between O3'(i-1) and P(i)
   1  T . C.DT3    0.006  anti,~C2'-endo,BI,non-pair-contact,ss-non-loop
   2  T . C.DT4    0.005  anti,~C2'-endo,BI,non-pair-contact,ss-non-loop,phosphate
   3  T . C.DT5    0.002  anti,~C2'-endo,ss-non-loop,phosphate
   4  T . D.DT3    0.009  anti,BI,non-pair-contact,ss-non-loop
   5  T . D.DT4    0.014  ~C2'-endo,non-pair-contact,ss-non-loop
   6  T . D.DT5    0.002  anti,~C2'-endo,ss-non-loop

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List of 9 additional files
   1 dssr-2ndstrs.bpseq -- secondary structure in bpseq format
   2 dssr-2ndstrs.ct -- secondary structure in connectivity table format
   3 dssr-2ndstrs.dbn -- secondary structure in dot-bracket notation
   4 dssr-torsions.txt -- backbone torsion angles and suite names
   5 dssr-stacks.pdb -- an ensemble of base stacks
   6 dssr-rotmat.txt -- position vector and rotation matrix
   7 dssr-viewV.pdb -- vertical view of the principal moment of inertia
   8 dssr-viewH.pdb -- horizontal view of the principal moment of inertia
   9 dssr-viewT.pdb -- top view of the principal moment of inertia