Hi ballardw,   Sorry for the late response.   I tried not to constrol the appearance of Y-axis but felt in the same issue. I removed the (order=) keyword from axis statement. The graph gave a range of (0-1) for each axis (X and Y) which I think is taken from the data points. Hence, once gain, SPLINE generated out of range (relative to data points) points whihc caused the curve to break in more than one place on the edges!     ... View more