I often end up shifting labels on my TikZ/PGFplot graphs using, for example,
yshift=1.0ex. Are these the correct units to be using to to the shifting? I don't think I should use absolute units as those won't adjust if the font sizes change similar to this question on Which measurement units should one use in LaTeX?.
Wondering if there special considerations that I should keep in mind since this is not related to ordinary text?