Single Magnetics Grid for testing plugin, data reprojected to WGS84 UTM28N and clipped from:
Taylor, C.D., ed., 2015, Second projet de renforcement institutionnel du secteur minier de la République Islamique de Mauritanie (PRISM-II) phase V: U.S. Geological Survey Open-File Report 2013‒1280, 20 chaps., pages variable, pls. variable, http://dx.doi.org/10.3133/ofr20131280. [In English and French.]