Vector images are typically generated using drawing or illustration programs (e.g., Adobe Illustrator) and are composed of mathematically defined geometric shapes—lines, objects, and fills. Vector graphics are resolution independent and can be sized up or down without quality loss.

• Use the same font for all figures. Standard fonts include Arial, Helvetica, Times, Symbol, Mathematical Pi, and European Pi.
• Vector line art: Common examples are graphs and charts created in illustration programs. It is preferable to save them as EPS files, with all fonts embedded, and graph lines at least 0.25 points wide. If you are using Illustrator, check the box that reads Embed Fonts when saving the file.
• Combination line/halftone: Quite often authors will insert raster images into a vector drawing program (e.g., Adobe Illustrator) to add text and labels. Assuming the inserted raster image(s) meets the required resolutions, save these combination files as an EPS with all fonts converted to outlines and graph lines at least 0.25 points wide.