

#puntosayac[zoom>=15]{
   point-allow-overlap:true;  
  [zoom=15]{point-file:url(res/puntoX20.png);}
  [zoom=16]{point-file:url(res/puntoX20.png);}
  [zoom=17]{point-file:url(res/puntoX40.png);}
  [zoom=18]{point-file:url(res/puntoX80.png);}
  [zoom=19]{point-file:url(res/puntoX80.png);}
 
}