So from about here to about here, this blue curve looks like a straight line. And what that basically means initially, when we add a small amount of concentration of S into our mixture, the rate, the velocity of that enzyme, the rate at which the enzyme catalyzes the reaction will be directly proportional. So we'll have a straight line with respect to that S, the concentration of substrate. But as we continue increasing the concentration of S, we see that the slope begins to decrease and the curve begins to level off. And eventually it approaches asymptotically the maximum velocity of that enzyme given by the red curve asymptotically means the blue curve never actually crosses that red line. So that horizontal red line basically describes the maximum rate of activity of that enzyme at which the enzyme can actually operate on that substrate and transform it into some type of product.