I have data in six series: A2, A1, B1, B2, B3, B4.
Two of these belong in one group, and four in another group.
Within these, there is a progression in the series: A2 > A1, B4 > B3 > B2 > B1.
In addition, A1 and B1 are somewhat similar (they are both "zero points").
I need a color scheme for a graph of data that will display data from all these series. As some of the resulting lines will be close together, using line markers is out of the question. Line styles are already used to express another aspect of the data.
The color scheme needs to be printer-safe as some users like to print and annotate this diagram.
How would I go about creating such a color scheme? My main problem is that there are different amounts of elemenets on the "left" and "right" side of this scheme.