Fig. 1. Relationships of data points relative to the azimuthal profiles of a mesocyclone as a function of angular separation (AS) values for (a)-(c) 1.0^o and (d)-(f) 0.5^o azimuthal sampling intervals. Continuous and discrete samplings of Doppler velocity azimuthal profiles across the center of the mesocyclone at a range of 150 km are indicated, respectively, by the nonpointed curve and superimposed dots. The true azimuthal profile is indicated by the curve with pointed peaks; vertical shading represents the mesocyclone's 5-km core diameter having a peak tangential velocity of 25 m s^-1. In (a)-(c), data points at A through E represent successive positions of the radar beam center at 1^o azimuthal increments as the beam scans across the mesocyclone; similarly, data points at A through I in (d)-(f) represent 0.5^o azimuthal increments. The horizontal line centered on X represents the effective half-power beamwidth (nominal resolution volume) for one beam position. Angular separation (AS) values of 0.0^o, +0.25^o, and +0.5^o in (a)-(c) and of 0.0^o, +0.125^o, and +0.25^o in (d)-(f) are indicated. Deduced mean rotational velocity (V_rot) in m s^-1 and core diameter (CD) in km are also indicated.