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DSMIN
This is minimum allowable absolute value of the pseudo-arclength
stepsize. DSMIN must be positive.
It is only effective if the pseudo-arclength step is adaptive,
i.e., if IADS0.
The choice of DSMIN is highly problem-dependent;
most demos use a value that was found appropriate after some
experimentation.
See also the discussion in Section 11.2.
Gabriel Lord
2007-11-19