Before revision:  Using the theoretical estimate (\proptoN where N is  number of nucleotides) for folding free energy barrier, k_F data for both the RNAs are quantitatively fit using one dimensional Kramers' theory with two parameters specifying the curvatures in the unfolded basin and the barrier top.
After revision:  By using the theoretical estimate (\proptoN where N is number of nucleotides) for folding free energy barrier, k_F data for both the RNAs are quantitatively fit using one dimensional Kramers' theory with two parameters specifying the curvatures in the unfolded basin and the barrier top.