After specification of this record, iterations will be performed
until *ratio* in **post_node_rhside_ratio** is less then *ratio_criterium*.
Typically, set *ratio_criterium* to 0.01 or 0.001.

TOCHNOG will now also adjust the time step size. If few iterations are needed the time step size is increased. If many iterations are needed the time step size is decreased.

The time step specified in **control_timestep** is used as initial step.
The time step is not allowed to become higher then *maximum_timestep*.
If the time step becomes very low compared to the initial step, time stepping is aborted.

The initial step as specified in **control_timestep**, should be sufficient small so
that this automatic algorithm can fulfill the *ratio_criterium* in that initial step.

tochnog 2001-09-02