for(var i = 0, data, sens; i < series.length; i++){
        if(!series[i].mouse.track) continue;
        data = series[i].data;
        sens = (series[i].mouse.sensibility*series[i].mouse.sensibility);
        for(var j = 0, xpow, ypow; j < data.length; j++){
          xpow = Math.pow(hozScale*(data[j][0] - mouse.x), 2);
          ypow = Math.pow(vertScale*(data[j][1] - mouse.y), 2);
          if(xpow < sens && ypow < sens && Math.sqrt(xpow+ypow) < n.dist){
            n.dist = Math.sqrt(xpow+ypow);
            n.x = data[j][0];
            n.y = data[j][1];
            n.mouse = series[i].mouse;
          }
        }
      }