By default I get a black marker colour for all plotted points on an individuals chart, as shown in attached file.
Supposed I want to stratify in some way and change the marker, or point, colour. In the attached this is the second column (column titled "Material").
How could I do this? For example, make all the values on the chart associated with 'A' be green, the 'B' values black and the 'C' values another, different colour.
Thanks for any input,