\pspicture(8,11)
    % Cadrillage gris 
  \psgrid[griddots=1,
            gridlabels=0pt,  % Pas de label
            subgriddiv=5, % 5 carrés toutes les unités
            gridcolor=black!40]
    % Cadrillage noir
  \psgrid[gridlabels=0pt,
            subgriddiv=1,
            gridcolor=black]
  \psaxes
  [
		%ytrigLabels=true,
        linewidth=\pslinewidth,
        %labelFontSize=\scriptscriptstyle,
        tickcolor=gray,
        ticksize=-1.5pt 1.5pt,
        xlabelsep=3pt,
        arrowscale=2, % Taille des flèches
        %trigLabelBase=4,
        Dx=5, % On ajoute 5
        dx=1, % tous les 1 sur l'axe des abscisses
        Dy=25,
        dy=1,
]{->}(0,0)(-0.1,-0.1)(8,11)
  \psset{algebraic,linewidth=1.5pt}

  \savedata{\mydata}[
  {35.,252.}, {10.,72.}, {3.47, 25.}, {30,216}]

\dataplot[plotstyle=curve,showpoints,dotstyle=x, linecolor=red!50]{\mydata}

\endpspicture