  We present fully analytic results for all master integrals for the three-loop
banana graph with four equal and non-zero masses. The results are remarkably
simple and all integrals are expressed as linear combinations of iterated
integrals of modular forms of uniform weight for the same congruence subgroup
as for the two-loop equal-mass sunrise graph. We also show how to write the
results in terms of elliptic polylogarithms evaluated at rational points.
