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Advice to Authors and Editors 5 <br /> Note.—Th e system of marking proofs can be made easier by the use of an imaginary vertical line <br />through the center of the type area. Th e placement of corrections in the left -hand margin for those <br />errors found in the left -hand portion of the proof and in the right-hand margin for right-side errors <br />prevents overcrowding of marks and facilitates corrections. <br />chapter1.indd 5chapter1.indd 5 11/13/08 2:03:14 PM11/13/08 2:03:14 PM