geometry rectangular

volume
     1.000000E+00    zone_0
     1.000000E+00    zone_1
     1.000000E+00    zone_2
     1.000000E+00    zone_3
end

mat_loading
    zone_0    mix_0
    zone_1    mix_1
    zone_2    mix_2
    zone_3    mix_0
end

mixture mix_0
    material fake_mat 1 0.55
    material water 1 0.45
end

mixture mix_1
    material fake_mat 1 0.2
    material water 1 0.3
    material helium 1 0.5
end

mixture mix_2
    material fake_mat 1 0.95
    material mat_void 1 0.05
end

