I have published this image as author under the Creative-Commons-Licence CC BY-SA 4.0.. This means that free usage outside of Wikimedia projects under the following terms of licence is possible:

• 1.1 The image is credited with "Denis Apel / flyingpixel.de / Wikipedia"

  If this is not possible due to shortage of space, please contact me first.

• 1.2 If possible a weblink to the original image would be great: https://commons.wikimedia.org/wiki/File:Waterfall-diagram-ft87_WSJT-X_Denis_apel.jpg

I would be happy to receive a specimen copy or the URL of the website where the image is used.

Please write an email to denis.apel@wikipedia.de, if you

• need the image in a higher resolution
• need my postal address for sending a specimen copy
• have further questions to the terms of licence

This license and the rights granted hereunder will terminate automatically upon any breach by you of the terms of this license. In this case the author reserves to demand declaration to cease and desist, and at least compensation (according to the MFM fee references currently in force).
Any of the above conditions can be waived if you get permission from the copyright holder.