It is possible to visualize the trajectory with xmgr :
With some models (like this one...), a small modification
of one parameter (a change of speed of 0.01 m/s in this case) changes the
whole behaviour of the system. It is important to control the values given
by a model and check they do not drive to a non-sense that is why using
observations is very important. The right balance between observation and
prevision can approach more easily reality.
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