1.2.5-20 Ordering Data in Segmented Curve Graphs

The data categories in a segmented curve graph should be ordered so that the least variable curves are displayed at the bottom and the most variable at the top.

Additional Information:
Sometimes there are independent logical grounds for the ordering of data categories. If a segmented curve graph that is constructed on a logical basis produces confusing irregularity of curves, then it might be better to display the data in some other graphic format. Any irregularity in the bottom curve will 'propagate' throughout the curves above it, which will make it difficult for a user to evaluate irregularities in the upper curves.