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\begin{tikzpicture} \tkzInit[ymax=4,xmax=5] \tkzAxeXY \tkzDefSetOfPoints[prefix=P]% {1/2,4/3,2/2.5} \tkzDrawPoints(P1,P2,P3) \tkzLabelPoints(P1,P2,P3) \end{tikzpicture}