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   Supralateral arc I 

Part of the complex display over Northern & Central England 9th February 2001. Photographed at Sheffield by Malcolm Garland ~1300 UT when the sun was 22� high. The horizontal column crystals which formed the supralateral arc also produced an intense upper tangent arc. The weakness of the 22� halo compared with the upper tangent arc indicates that the outer halo was a supralateral arc rather than a 46� halo. The background is a HaloSim3 simulation. Images �Malcolm Garland, reproduced with permission.