author here! i think putting the unit in the header also works just fine. it's the same "ink" either way, so it comes down to particular usage. color-wise, one

author here! i think putting the unit in the header also works just fine. it's the same "ink" either way, so it comes down to particular usage. color-wise, one of the strongest reasons to not use color is the exact situation you mentioned; in some countries (namely, china), green values are negative and red are positive.