element-type cx cy dx dy r aThe first entry defines the type of the element, either rectangle, ellipse, triangle, sector, or segment.
For all phantom elements, r is the rotation applied to the object in degrees counterclockwise and a is the X-ray attenuation coefficient of the object. Where objects overlap, the attenuations of the overlapped objects are summed.
As opposed to the r and a fields, the cx, cy, dx and dy fields have different meanings depending on the element type.