They should be provided as good-quality hard copies suitable for reproduction as submitted. No additional artwork, redrawing or typesetting will be done by the publishers. Figures must be carefully drawn in black, waterproof drawing ink, to draftsman's standards, with lettering by stencil or drawing machine. Computer graphics is preferable. Freehand, penciled, or typewritten lettering is not acceptable.
Legends are to be typed together on a separate sheet.
Small figures must be mounted on sheets of full manuscript page size. The original and two duplicates of each figure are required. Ink drawings should also be supplied for complex molecular formulas or diagrams which the printer cannot readily set in type. Illustrations in color can be accepted only if the authors defray the cost. However , three hard copies should be supplied - one for the editor and two for the referees.