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T. majus fronts move up oxygen gradients at a constant velocity. The front shows displacement linearly with time. The black line shows constant velocity. (Inset) The mean speed of the veil up the oxygen gradient is 10−4 cm⋅s−1. The corresponding oxygen flux into the front 
pmol⋅cm−2⋅s−1 is consistent with past estimates in natural veils (19).
