What is the problem or goal the end user is trying to solve or accomplish?
Customer would like the ability to chart the difference between 2 line series charts. For example, data for 2 countries charted as 2 lines - the variance would be another line introduced.
How are they solving it currently?
Possible use of annotation layer.
What is the recommended solution by the Customer?
Ability to have an advanced analytics function that allows the actual value difference to be charted.