So for each of these points, the error between it and the line is the vertical distance. So this right here we can call error 1. And then this right here would be error 2. It would be the vertical distance between that point and the line. Or you could think of it the y value of this point and the y value of the line. And you just keep going all the way to the end point between the y value of this point and the y value of the line. So this error right here, error 1, if you think about it, it is this value right here, this y value.