  The equilibrium topology of superconducting and normal domains in flat type-I
superconductors is investigated. Important improvements with respect to
previous work are: (1) the energy of the external magnetic field, as deformed
by the presence of superconducting domains, is calculated in the same way for
three different topologies, and (2) calculations are made for arbitrary
orientation of the applied field. A phase diagram is presented for the
minimum-energy topology as a function of applied field magnitude and angle. For
small (large) applied fields normal (superconducting) tubes are found, while
for intermediate fields parallel domains have a lower energy. The range of
field magnitudes for which the superconducting-tubes structure is favored
shrinks when the field is more in-plane oriented.
