Figure 7.  This figure illustrates the spatial relationship of the air bubbles to the skull. Two density ranges representative of bone (in shades of red) and air (in shades of blue) were rendered opaque with all other densities set to transparent. The large concentration of air in the oral cavity is likely due to entrapment of atmospheric gasses as the skull was entombed whereas bubbles in the rear portion of the skull are likely representative of out-gassing of decomposing organic material. The orientation of the bubbles indicate the skull was in an approximately upright position subsequent to entombment and while the resin was still sufficiently viscous to allow transport of air bubbles.