H1'  C1'  N9   C4 : chi adenine
  H1'  C1'  N9   C8 : chi adenine
  C4'  C3'  O3' +P  : epsilon
  C2'  C3'  O3' +P  : epsilon
  H3'  C3'  O3' +P  : epsilin
  P    O5'  C5'  C4': beta
  H4'  C4'  C5'  H5': Gamma, averaged only on Yokoyama1 and Yokoyama2
  H3'  C3'  C4'  H4': Delta, averaged only on Yokoyama1 and Yokoyama2