Combination chart without aggregation

The chart below (created using the "charts" module) shows a combination chart (consisting of 2 area charts) about all nodes of content type "Article", which has these fields with these "machine names" (+ values):

- "field_optionlist" (with some select list values, such as the "year")
- "field_free_format_text" (assumed to contain some numeric values), with Y-axis left, is used in the parent chart.
- "field_free_format_nr" (assumed to contain some numeric values), with Y-axis right, is used in the child chart.

The chart below (created using the "charts" module) shows a single line (not area) chart which is "attached" to the previous combination chart. It is about all nodes of content type "Article", which have these fields with these "machine names" (+ values):

- "field_optionlist" (with some select list values, such as the "year").
- "field_free_format_text" (assumed to contain some numeric values), shown on the Y-axis.