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.
Keywords from Image Description:
Light characteristicsfr.svg characteristic patterns and example standard chart abbreviations Lightcharacteristics svg UTC Lightcharacteristics svg Traced by User Stannered derivative work Pline translation in french Pline Lightcharacteristics svg PDuserw Original upload log This image is derivative work of the following images