Const
Sentinel for a figure-wide axis label that the JSON did not author. Empty (rather than 'X'/'Y' like a layer axis) so callers can tell "no figure-level label" apart from an authored one and fall back to the focused subplot.
Sentinel for a figure-wide axis label that the JSON did not author. Empty (rather than 'X'/'Y' like a layer axis) so callers can tell "no figure-level label" apart from an authored one and fall back to the focused subplot.