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The global parameters characterize a given model as a whole.
They are:
- time-unit
- is the duration of the smallest time interval
taken into consideration during simulation,
typically 1ms;
- size-unit
- is the size of the simulation cell,
typically 1mm (which means the simulation cell would
have 1 cubic mm in volume);
- x-size, y-size, z-size
- are the number of size units
on the 3 dimensions of the model inside which all the
anatomic elements described in the cord model find their
place; the
dimension goes from the right of the patient
to the left, the 
goes superior to inferior, and 
goes from posterior to anterior;