This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Kronum Field. fr Diagramme du terrain de Kronum fait avec GIMP en Diagram of Kronum's field created with GIMP own Coukaratcha cczero Uploaded with Transparent background
Page 2023 Free-images.com. All images are Public Domain