COLOR SHADED-RELIEF IMAGES OF THE FINAL GRIDDED DATA Color shaded-relief images of the final magnetic data at a scale of 1:2,000,000 are available in three formats for each survey area, annotated with tick marks, map scale, and color scale bar. Tagged Image Format file - .tif JPG image format file - .jpg Portable Document Format image format file - .pdf file for Adobe* Acrobat readers. * Trade names are used for descriptive purposes only.