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The min / max rotational velocities are the profile min/max for the spin behavior. It has acceleration characteristics by the rotational_acc_lim parameter, as it tries to accelerate to the max speed and then decelerate to stop. Think of the min speed as the minimum rotational speed required to overcome stall torque of the platform (or how slow you might want the robot to rotate as a behavioral element, higher than the stall speed).

The max speed is the one that defines how fast you can go, according to the acceleration profile.