One of the most important things to remember when formatting Excel spreadsheets is that the margins on the page should be at least four spaces. These are usually set in the program as the "auto margins" and should be marked accordingly. It is a good idea to use the Backslash (/) character to set the margin too since it will automatically close the gaps between cells. For example, if the last cell has an opening vertical tab and the first cell has a closing vertical tab, the former character will always be used to close the gap.