8 One could use the following hacky workaround (for a cleaner solution, please see https://github.com/lvjr/tabularray/issues/226#issuecomment-1086623661):
7 The usual advice in presenting quantitative information is to keep the information/ink ratio as good as possible. Amongst other things, this means that repetitive information should be avoided if possible.
6 Since you indicated that you are using TeXLive2019, I would probably use a matrix from Ti*k*Z. You can use the counts `\pgfmatrixcurrentrow` and `\pgfmatrixcurrentcolumn` to achieve any coloring pattern you want.