Logarithm of the absolute value of the amplitude of the numerical azimuthal velocity as a function of the logarithm of the Ekman number at z = 0.5. The left panel is for η = 0.15, the middle one is for η = 0.25 and the right one for η = 0.5. Inside the tangent cylinder, measures were taken respectively at the points s = 0.1,0.2,0.25, the azimuthal velocity scales around E^{− 1 / 2}. It is proportional to E^-1 within the envelope s = 0.65. Note that the azimuthal velocity is mainly negative for small cores and positive for bigger cores like η = 0.5.