Suppose that I have this table tab, which I display using Grid. Is it possible to force the columns to be equally spaced? All columns should be the same width and no data should be discarded/hidden from view.
tab = {{"aaaa", "b"}, {"1", SpanFromLeft}, {"2", SpanFromLeft}, {"3", SpanFromLeft}};
Grid[tab, Frame -> {None, None, {{1, 1} -> True, {1, 2} -> True}}]

