When you perform a capability analysis, you do not have to re-specify the limits each time. Use the Column Properties > Spec Limits property in a data table to save specification limits as a column property. Saving these limits in a column also facilitates consistency from use to use. For example, you might run an analysis that uses these limits. When you come back later and change the data, you can run a new analysis on the new data using the same limits. Spec Limits Section of the Column Properties Window displays the Spec Limits section of the Column Properties window for OZONE in the sample data table Cities.jmp.

The Show as graph reference lines option draws specification limits as reference lines on a graph. For more information about column properties, refer to The Column Info Window in the Using JMP book.