1.3.6-8 Consistent Scaling

If users must compare graphic data across a series of displays, the same scale should be used for each.

Additional Information:
Note that in many applications it may prove more effective to display data for comparison in a single combined chart, rather than requiring users to compare data across a series of charts. Users will find it difficult to compare data sets that are scaled differently. Moreover, users may overlook differences in labeling, and assume that the same scale has been used even when displayed scales are actually different from one another.