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Aspect ratio :
From left to right : 1.9m² (AR=3.8), 4.5m² (AR=4.3), 5.5m² (AR=5.2), Oxo 2.7m² (AR=7).
For information, the 1.9m² and the Oxo have the same maximal chord, and the 4.5m² and the Oxo have an identical span lenght.