Data was obtained from the supplimentary materials from the
paper:

C. Kojima, A. Ono, M. Kainosho, and T. L. James 
"DNA Duplex Dynamics: NMR Relaxation Studies of a Dodecamer
with Uniformly 13C-Labeled Purine Nucleotides" 
J. Mag Res, 135, 310-333 (1998) 
