A more general version also holds. One may replace the balls "B"  by a family formula_6 of sets "U"  of "bounded eccentricity". This means that there exists some fixed "c" > 0 such that each set "U"  from the family is contained in a ball "B"  with formula_7. It is also assumed that every point "x" ∈ R"n" is contained in arbitrarily small sets from formula_6. When these sets shrink to "x", the same result holds: for almost every point "x",