molecule cycles between 10 and 49 degrees Celsius
 
veryfast: let molecule 10 arbitrary time units to fold per temperature step.
          the temperature cycles are so fast that the molecule cycles only
          between the low T mfe and a substructure of it, but never
          switches to the high T mfe

fast: let molecule 100 arbitrary timeunits to fold per temperature step.
      the temperature cycles are slow enough, that the high T mfe gradually
      gains in population density while the two structures from the veryfast
      case loose population density.

medium: let molecule 1000 arbitrary timeunits to fold per temperature step.
        complicated intermediate dynamics. high T mfe gains population
        density while low T mfe looses population density. the transfer of
        populations density from low T mfe to high T mfe works via a very
        complicated dynamics of many different intermediary states.  

slow: let molecule 1e11 arbitrary timeunits to fold per temperature step.
      relative clean cycling between low and high T mfe.