Coordinate paper is not acceptable. Electronic files or high-quality glossy prints with sharp even lines and lettering should be submitted in place of original drawings when these are of exaggerated size and awkward to handle. Photographs of standard apparatus in a laboratory setup are not instructive and should not be included. No heavy writing should be made on the backs of photographs nor should they be clipped or stapled, which may result in damage to the picture. The figure number and author's name should appear on the back of each illustration.
Screened photographs are unacceptable.
If micrographs are critical for accurate review authors should supply an original set in each copy of the manuscript. Micrographs should contain a fiducial mark that indicates explicitly the scale length that is being shown. Specification of the reduction ratio in the caption is not adequate. Any arrows or lettering in the micrograph must satisfy the same scaling restrictions as those indicated above for line drawings. All photographs will be reduced to single-column width, unless otherwise necessary.