Examples of the estimation of the kinematic center (KC) position for NGC 2347, a galaxy with a single peak in the velocity gradient image (panels a) and b)), and NGC 5947, an object with a ring structure in the central region of the velocity gradient distribution (panels c) and d)). Left panels show the ionized gas velocity field (from Hα+[N ii] following the procedure in 3.1) in the inner region of NGC 2347 (panel a)), and NGC 5947 (panel c)). Right panels correspond to the average derivative of the Hα+[N ii] velocity field for NGC 2347 (panel b)), and NGC 5947 (panel d)) normalized to their velocity gradient peaks. Green open squares indicate the velocity gradient pixels used to estimate the KC location through the average of their positions weigthed by their gradient values. Contours from the stellar continuum are overlapped. The white plus sign marks the location of the optical nucleus (peak of the stellar continuum) and the black circle indicates the estimated KC position.