English: Map plotting the touchdown points of tornadoes during a tornado outbreak that impacted portions of the Southern and Eastern United States between April 4–5, 2011. Plots and image created using QGIS with data from the National Oceanic and Atmospheric Administration.
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.