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Meanwhile the short-span D.IIc prototype had been further refined, and with narrower-chord upper and lower wings, using the Göttingen 180 airfoil, each of 1.00 meter dimension from leading to trailing edge, the performance improved noticeably, both in top speed and in climb rate. An order for this model, now known as the D.IV, was placed in March 1918, and followed with several additional orders as the qualities of the design became obvious. The planes started reaching operational units in August, but of the 280 ordered only 123 were completed by the end of the war, about half of those reaching operational units. In October 1918 it was officially described as superior by far to all single-seaters in use.