M. Zuker
Mfold web server for nucleic acid folding and hybridization prediction.
Nucleic Acids Res. 31 (13), 3406-3415, (2003)

• Page 3413, column 1 near the bottom. In the formula for $T_{\rm m}$, the ``$\Delta H$'' (enthalpy) in the denonminator should be ``$\Delta S$'' (entropy). Thus, the formula should read:
  
  $$T_{\rm m}= 1000 \times \frac{\Delta H}{\Delta S + R \ln C/f} \:$$
  
  

  Furthermore, the following line about the value of f is wrong. It should read:

  where f=4 if ${\mathbf A} \neq {\mathbf B}$ and f=1 if A = B.