Mick Chanthaseth

@yygrechka, Could you add a filter? instead of `chart.draw_series(points1.iter().zip(points2.iter()).map(|(x,y)| Circle::new((*x,*y), 3, RED.filled())));` do `chart.draw_series(points1.iter().zip(points2.iter()).filter(|(x,y)| **y < 1f64).map(|(x,y)| Circle::new((*x,*y), 3, RED.filled())));`