Assigning value columns to groupings

[Yuri05]

a. We currently define plot layout (colors, symbols, etc.) based on 1 or more grouping columns. But what if we don’t have any grouping columns at all? E.g. in the simplest case where we have just 2 columns (Time, Concentration): how do we assign a colour to the curve?

Time	Concentration Brain
1	4
2	5
3	6

b. If we have more than one value column in a data table: how do we assign different plot properties to those columns? E.g. if we have data table like below and would like to have simulatedas lines and observedas dots – how should we do this?

Time	Location	Simulated	Observed
1	Brain	4	5
2	Brain	5	6
3	Brain	6	7
0	Lung	7	8
5	Lung	8	9
10	Lung	9	10

[Yuri05]

@KatrinCoboeken @ju-rgen @incei @sfrechen FYI