CHG END (change endpoint) allows you to modify the end
condition of an existing spline for any of the following
purposes:

- to modify the magnitude of an existing end tangent
  vector.
- to alter the direction of an existing end tangent vector.
- to assign a new end tangent vector.
- to assign a zero curvature to an end.

Select a spline near the desired end to be modified.

A new menu is displayed, offering various end conditions
for the selected 2-D or 3-D spline. End conditions are as
follows:

NATURAL - to assign a curvature of zero to the appropriate
          end of the spline.

2 PTS   - to specify a tangent vector at a spline end 
          point by indicating two points.

ENDENT  - to specify a tangent vector by using the 
          tangency at the end of an existing entity.

TANGENT - to enter the x, y, (and z if 3-D) vector
          components and magnitude of a desired tangent 
          vector.

ANGLE   - (for 2-D splines only) to determine the 
          direction of a tangent vector by setting the 
          angle between the tangent vector and the 
          positive x axis.

After an end condition is selected, the spline is redrawn
using the new end condition data. The 2-D or 3-D
specifications are still assigned.
