Before revision:  From the fits, we find that the speed limit to RNA folding at water viscosity is between (1-4) \mathrm{\mu s}, which is in accord with our previous theoretical prediction as well as results from several single molecule experiments.
After revision:  From the fits, we find that the speed limit to RNA folding at water viscosity is between 1 and 4 \mathrm{\mu s}, which is in accord with our previous theoretical prediction as well as results from several single molecule experiments.