This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionCoefficients of Lift and Drag for a Hypothetical Sail.png
English: Coefficient of lift (CL) and Coefficient of drag (CD) and their ratio as a function of angle of attack for a hypothetical sail. The status of flow between attached to separated is shown in relation to the curve.
Français : Coefficient de portance (CL, lift) et Coefficient de traînée (CD, drag) et leur rapport en fonction de l'angle d'attaque pour une voile hypothétique. L'état de l'écoulement entre l'attaché et le séparé est montré en relation avec la courbe.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.