If i have 3 categories, group a, group b, and group c. And i have results from time point 1 and time point 2. So you can have a1, a2, b1, b2, c1, c2. If there was only one category and 2 time points, I would plot a graph where a1 is black and a2 is grey.
I want to keep easily distinguishable colours and they need to be printed in black and white, because of who this is going to.
I'm colour blind. Not badly, but enough to maybe ask this question.
I would like to have a Dark something / Light something combo for a,b,and c, that can be easily distinguished on a screen and on a badly prnted page.