RNA duplex m-values as a function of temperature. 5′-r(GAAAUUAUAAAG)-3′ (crosses), 5′-r(GAAAGUAUAAAG)-3′ (plus symbols), 5′-r(GAUAGUAGAUAG)-3′ (filled squares), 5′-r(GAAAGUAGAAAC)-3′ (open squares), 5′-r(GCAAAGUAAACG)-3′ (open triangles), 5′-r(GCAAAGCAAACG)-3′ (filled circles), 5′-r(GCAUAGCAUACG)-3′ (open circles), 5′-r(GCGAAGCCAACG)-3′ (open diamonds), 5′-r(GCGCCGCCGGCG)-3′ (dash).