PSR J1019-5749. Top: for each model the best joint fit solution γ-ray light-curve (thick black line) is superimposed on the LAT pulsar γ-ray light-curve (shaded histogram). The estimated background is indicated by the dash-dot line. Bottom: for each model the best joint fit solution radio light-curve (black line) is superimposed on the LAT pulsar radio light-curve (grey thick line). The radio model is unique, but the (α,ζ) solutions vary for each γ-ray model. Because of the low statistics of the γ-ray light curve, the best-fit solution of each model is dominated by the radio light curve. The optimum-solution is given by the SG model but it represents an unreliable result since the best fit γ-ray light curve corresponds to a flat profile.