1.   He drew a line on the paper in a smooth curve.

2.   On a smooth curve, both the values and the slopes at neighbouring time points are close together.

3.   The basic idea is that a few parameters are turned into a smooth curve by a standardised computation.

4.   This is rather like being able to draw a straight line tangent at any point on a smooth curve.

5.   Where the Septum meets the body wall it does so in a smooth curve.

6.   The yield curve is a smooth curve through those points.

7.   The fitted curves are then spliced together to produce a single smooth curve over the entire range.

8.   These points are plotted and joined by a smooth curve which is the cumulative density function.