This image is online,but there's no discussion.
The car is a modified 1983 GM Aero 2002,which was originally Cd 0.14.
New skirts use a lower flow fence to sequester the air above the belly line,while allowing sectional density control between the wheels.
The flow fence is continued behind the wheels.
It would have been beneficial had someone with GM mention why they chose this streamlining path.
Here's link to the original '83 Aero 2002
http://deansgarage.com/wp-content/ga...hcenter650.jpg
Here is the '84 Citation IV, Cd 0.18
http://storkli.com/wp-content/upload...on-IV-1984.jpg
The car at the top is referred to as the GM Aero.With full skirts,it's more refined than any of the 'published' cars.