def getSegment(self, cell, idx):
return self._cells[cell]._segments[idx]<EOL>
Returns a :class:`Segment` object of the specified segment using data from 
the ``self._cells`` array.

:param cell: (int) cell index
:param idx:  (int) segment index on a cell
:returns: (:class:`Segment`) Segment object with index idx on the specified cell