Display Two curves on the same figure

The operator creates a list of one or more elements specified. Details can be found in the online help. Lists can be treated as one dynamic curve (with a graph for each element) or multiple static curves in a diagram.

If one just wants to multiple graphs depicted in a diagram, this can be achieved selecting multiple datasets when creating the diagram. It is also possible to add new curves to an existing diagram.

Possibly it is a misunderstanding. With an FPScript formula, one cannot create, delete or change the properties (with some minor exceptions) of other objects. Thus it is not possible to create a diagram within FPScript code. But one can provide a list of two or more datasets in a formula that can be depicted in a diagram.

It may be helpful to view this (french) introduction video (https://www.youtube.com/watch?v=07h2k5SMUa8), where a second curve is added interactively to an existing diagram.