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2 changes: 1 addition & 1 deletion tidy3d/components/simulation.py
Original file line number Diff line number Diff line change
Expand Up @@ -1215,7 +1215,7 @@ def num_cells(self) -> int:
Number of yee cells in the simulation.
"""

return np.prod(self.grid.num_cells)
return np.prod(self.grid.num_cells, dtype=np.int64)

@staticmethod
def _add_pml_to_bounds(num_layers: Tuple[int, int], bounds: Coords1D):
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