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Fig. 6. Time evolution of averaged velocities (A) and their standard deviations (B) for the cells located in the camera field of view. Absolute projected velocity Vp, vertical velocity Vz and horizontal velocity Vx. Diamonds with error bars correspond to the instant values <Vx>r,b, <Vz>r,b, <Vp>r,b. Solid lines correspond to averaged values of Vp, Vz and Vx in A and to their standard deviations in B, obtained using an equation similar to Equation 5.