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@ -139,7 +139,7 @@ class Grid(object):
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# If shift is negative, use left cell's dx to determine shift
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for a in range(3):
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if shifts[a] < 0:
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dxyz[a] = numpy.roll(dxyz, 1)
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dxyz[a] = numpy.roll(dxyz[a], 1)
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return [self.exyz[a] + dxyz[a] * shifts[a] for a in range(3)]
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