tmp.pdb
tmp.out
     2 #duplex 
 39 # number of basepairs
     0 0  # expl bp numbering numbering / hetero atom
-89 89
-88 88
-87 87
-86 86
-85 85
-84 84
-83 83
-82 82
-81 81
-80 80
-79 79
-78 78
-77 77
-76 76
-75 75
-74 74
-73 73
-72 72
-71 71
-70 70
-69 69
-68 68
-67 67
-66 66
-65 65
-64 64
-63 63
-62 62
-61 61
-60 60
-59 59
-58 58
-57 57
-56 56
-55 55
-54 54
-53 53
-52 52