Copy editing is the work that an editor does in order to improve the formatting, style and/or accuracy of a manuscript. He/she is not editing content when copy editing. For this he/she uses copy editing marks on the copy. Wikipedia has a great article on copy editors. For a look at the marks try these resources online. CopyEditor.TopSoftwareGuide.com or
. www.wiley.com/legacy/authors/guidelines/stmguides/4-fig1.htm