Autodesk CIVIL3D - CIVILDESIGNCOMP 2007 SLM CD Tutorials Manual page 232

7 The command line prompts you to Select Point Objects or
[Numbers/Groups]. Enter G.
8 In the Point Groups dialog box, select _All Points. Click OK. The points
in the drawing are selected.
The Regression Data vista displays information about each of the points
that are included in the regression analysis. The drawing displays a dashed
red line indicating the path of the best fit curve. An X marks the location
of each regression data point.
NOTE The point numbers in the Pt No. column are sequentially generated
as regression data points are added or removed. They do not correspond to
the actual AutoCAD Civil 3D point numbers.
Now you will modify some of the regression data to better suit your
design.
9 In the Regression Data vista, select the Pass Through check box for Pt No.
16.
Selecting this check box specifies that if the curve does not deviate from
the regression data, it will always pass through point 16.
10 Click
220 | Chapter 8 Alignments Tutorials
to create the best fit floating curve.