This image is licensed under a Creative Commons Attribution-Non Derivative Works 4.0 International License. I.e. the illustrations can also be used for commercial purposes free of charge. However, the illustrations are not copyright free, but the usage is allowed under the following conditions:

You must credit “www.sciepro.com” as the author and indicate the license (CC BY-ND 4.0 EN).
Modifying illustrations is not allowed, especially removing our logo / URL.

If you use the illustration on a website, we would appreciate a link to www.sciepro.com

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