Plot of specific angular momentum ( l) as functions of the sonic radius( r _c ) is shown for five sets of Kerr parameters a= 0.999, 0.75, 0.5, 0.0, −0.999 (from bottom curves to top). For some range of energy and angular momentum, curves may have three intersections, signifying the presence of three sonic points. The behavior of curves shows that inner (I) and outer(O) sonic points move inward while middle (M) sonic point moves outward in the higher energy and angular momentum region.