void DrawMarkerSized(int n, double *x, double *y, double *s)
{
   TMarker *m = new TMarker();
   m->SetMarkerStyle(20);
   m->SetMarkerColor(kBlue);
   for (int i=0; i<n; i++) {
      m->SetMarkerSize(s[i]);
      m->DrawMarker(x[i], y[i]);
   }
}

void graphsizemarker() {
   auto c = new TCanvas();
   c->DrawFrame(-2,-0.0015, 12, 0.0015);
   const int n=6;
   double x[n] = {0, 2, 4, 6, 8, 10};
   double y[n] = {0, 0, 0, 0, 0,  0};
   double s[n] = {1,2,3,4,5,6};
   DrawMarkerSized(n, x, y, s);
}