Any column traced on a graph can display error bars in either the X or Y directions at each point.  To display error in the X direction, invoke the Options dialog for the X column.  For the Y direction, invoke the Y Column Options Dialog.

To invoke the Column Options dialog, double-click the column name in the table, or choose Column Options from the Data menu, then choose the Options tab.  Enable the error bar calculations and then choose how you want the error calculated.  For each point, you can choose an error constant or you can get the error values from another column.  This error number can then either be interpreted as a percentage of the base value, or as a fixed value. To plot the error bars, double-click on the graph or choose Graph Options from the Options menu and check the error bar boxes.

For example, suppose you had two columns, X and Y, both with values from 1 to 10.  If you chose Column Options for Y, set the error constant to 10, and chose Percentage, the error values would be 0.1, 0.2, ..., 1.0.