TABLE 1.

NN standard free energies ΔG₃₇ (in kcal/mol)

Dimer set	Unified	Self-consistent
TA	−0.58	−0.57 ± 0.04
AT	−0.88	−0.91 ± 0.04
AA-TT	−1.00	−0.97 ± 0.02
AG-CT	−1.28	−1.20 ± 0.04
GA-TC	−1.30	−1.35 ± 0.03
AC-GT	−1.44	−1.28 ± 0.03
CA-TG	−1.45	−1.48 ± 0.03
GG-CC	−1.84	−1.82 ± 0.04
CG	−2.17	−2.14 ± 0.04
GC	−2.24	−2.19 ± 0.06
A-T ending	1.03	0.92 ± 0.08
C-G ending	0.98	0.85 ± 0.07
Symmetry	0.43	0.43

The unified set proposed by SantaLucia (10) is compared to the self-consistent set. Both sets have been obtained by model fits to the same 108-sequence data set (11).