N = int(input())
P = [tuple(map(int, input().split())) for _ in range(N)]
P = [(x + y, x - y) for x, y in P]

mi = min(P, key=lambda a: a[0])[0]
ma = max(P, key=lambda a: a[0])[0]

l = -1
r = 1 << 31

while r - l > 1:
    m = (l + r) // 2
    d = m / 2
    x1 = mi + d
    x2 = ma - d

    left = []
    both = []
    right = []
    ok = True
    for x, y in P:
        a = abs(x - x1) <= d
        b = abs(x - x2) <= d
        if a and b:
            both.append(y)
        elif a:
            left.append(y)
        elif b:
            right.append(y)
        else:
            ok = False
            break
    if not ok:
        l = m
        continue

    y = ()
    if both:
        y = y + (min(both) + d, max(both) - d)
    if left:
        y = y + (min(left) + d, max(left) - d)

    for y1 in y:
        if left and (abs(y1 - min(left)) > d or abs(y1 - max(left))) > d:
            continue
        rem = right + [y for y in both if abs(y - y1) > d]
        if not rem or max(rem) - min(rem) <= 2 * d:
            r = m
            break
    else:
        l = m

print(r)