Centre of Inversion on Twofold Axis (2 / m)

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2/m
The symbol above shows a twofold axis perpendicular to the plane of the screen, i.e parallel to Z, with a centre of inversion on the axis. This combination results when there is a mirror plane perpendicular to the twofold axis, hence the written symbol "2 / m". A fractional value next to the symbol indicates the height of the inversion centre above the XY plane.


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