Alexeev et al., ``The structure of poly(dA) . poly(dT) as revealed by an
X-ray fiber diffraction''. J. Biomol. Str. Dyn, 4, pp. 989-1011, 1987.

Table II: Cylindrical polar coordinates of atoms in a pair of nucleotides in
Ca-poly(dA).poly(dT) (left, #44) and in Na-poly(dA).poly(dT) (right, #45)

Group           Atom    R(nm)   Phi(deg)   Z(nm)    R(nm)   Phi(deg)   Z(nm)
------------------------------------------------------------------------------
Phosphate       P       0.961   86.4       0.251    0.978   89.1       0.279
                O1P     0.963   93.3       0.158    0.986   95.8       0.184
                O2P     1.096   83.1       0.268    1.111   85.9       0.307
                O3'     0.906   89.2       0.394    0.910   92.0       0.416
                O5'     0.861   79.1       0.207    0.882   81.9       0.227
Sugar           C1'     0.614   59.1       0.092    0.620   63.4       0.106
                C2'     0.725   63.4       0.000    0.735   66.3       0.012
                C3'     0.849   61.7       0.088    0.857   64.6       0.103
                C4'     0.797   62.9       0.231    0.805   66.3       0.245
                C5'     0.847   71.7       0.299    0.869   74.4       0.314
                O4'     0.652   62.6       0.223    0.661   67.5       0.234

Adenine         N1      0.152   19.2       0.011    0.133   36.4       0.013
                C2      0.282   20.5       0.038    0.260   29.3       0.045
                N3      0.375   36.6       0.057    0.364   43.7       0.068
                C4      0.363   57.6       0.047    0.370   64.8       0.054
                C5      0.279   76.4       0.021    0.302   84.3       0.021
                C6      0.141   73.7       0.002    0.165   88.7       0.000
                N6      0.119  133.9      -0.025    0.165  135.2      -0.033
                N7      0.384   92.4       0.018    0.417   97.0       0.016
                C8      0.486   82.3       0.043    0.512   86.7       0.045
                N9      0.485   66.1       0.062    0.497   71.4       0.070


Phosphate       P       0.961   -86.4     -0.251    0.969  -81.8      -0.215 
                O1P     0.963   -93.3     -0.158    0.969  -88.4      -0.119     
                O2P     1.096   -83.1     -0.268    1.102  -78.3      -0.227
                O3'     0.906   -89.2     -0.394    0.924  -84.9      -0.360
                O5'     0.861   -79.1     -0.207    0.863  -74.6      -0.181
Sugar           C1'     0.614   -59.1     -0.092    0.622  -53.3      -0.083
                C2'     0.725   -63.4      0.000    0.719  -57.1       0.026
                C3'     0.849   -61.7     -0.088    0.854  -56.9      -0.051
                C4'     0.797   -62.9     -0.231    0.816  -58.4      -0.197
                C5'     0.847   -71.7     -0.299    0.877  -66.8      -0.261
                O4'     0.652   -62.6     -0.223    0.670  -58.4      -0.203
                        
Thymine         N1      0.485   -66.1     -0.062    0.484  -58.7      -0.060         
                C2      0.376   -54.9     -0.051    0.389  -45.7      -0.047
                O2      0.413   -38.1     -0.065    0.444  -30.7      -0.053
                N3      0.255   -66.1     -0.023    0.257  -52.3      -0.026
                C4      0.283   -95.1     -0.006    0.253  -83.6      -0.017
                O4      0.236  -120.0      0.019    0.186 -110.8       0.002
                C5      0.426   -94.8     -0.019    0.395  -87.5      -0.032
                C5M     0.515  -109.5     -0.001    0.470 -104.8      -0.024
                C6      0.505   -81.8     -0.046    0.487  -75.0      -0.053

