add_mask, m1, EXTENT, 0, 6, 0, 6, 0, 6
add_mask, m2, EXTENT, 3, 9, 3, 9, 3, 9
add_mask, m3, EXTENT, 3, 9, 0, 6, 3, 9
add_mask, m4, EXTENT, 3, 9, 3, 9, 0, 6

add_mask, ma, SUB, 2, @m1, @m2
add_mask, mb, SUB, 4, @m1, @m2, @m3, @m4

add_postprocess, x1, MASK, :all, SET, @ma
add_postprocess, x2, MASK, :all, SET, @mb
add_postprocess, xa, VOLUME_INTEGRAL, :x1
add_postprocess, xb, VOLUME_INTEGRAL, :x2

add_field_variable, v1, GET, :xa, *vint-v
add_field_variable, v2, GET, :xb, *vint-v

NumberOfGeom, 1

Geom_file, -
Geom_shape, SET, BOX, $v1, $v2, 0.0, 999.9, 999.9, 999.9

