If you Named index data is 0 or 1 based
Fig.Plot(1..10).Index.Base = 0|1
Default: 0 (can be set in the Default Configuration)
Depending on how you have indexed your starting data point.
Most programming languages define 0 as the first data point in an array. While humans typically think of 1 as being the first data point.
This allows you to index your data in the way that suites your needs.