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
DescriptionUP-curve of partially shaded solar generator.png
English: UP-curve of a partially shaded solar generator, with marked local and global MPP
Deutsch: UP-Kennlinie eines teilverschatteten Photovoltaik-Solargenerators (2 von 10 Modulen sind verschattet, erhalten aber noch 20% diffuse Einstrahlung). Lokaler und globaler MPP sind rot bzw. grün markiert.
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.