Switch between zoom levels 3 and 4 after each 5x4 tiles fetch
Switch between zoom levels 3 and 4 after each 5x4 tiles fetch

manueltimita/Windshaft,CartoDB/Windshaft,wsw0108/Windshaft,wsw0108/Windshaft,CartoDB/Windshaft,wsw0108/Windshaft,HydroLogic/Windshaft,manueltimita/Windshaft,manueltimita/Windshaft,HydroLogic/Windshaft,HydroLogic/Windshaft,CartoDB/Windshaft