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is the scale height of the disk, and is a free parameter between zero (no accretion) and approximately one. In a turbulent medium , where is the velocity of turbulent cells relative to the mean gas motion, and is the size of the largest turbulent cells, which is estimated as and , where is the Keplerian orbital angular velocity, is the radial distance from the central object of mass . By using the equation of hydrostatic equilibrium, combined with conservation of angular momentum

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