Figure 2.

Final processed image. The symmetry has been produced by reflection in the mid-line axis to compensate for the unilateral plane laser-sheet illumination. The white outline represents the approximate position of the mask when looking vertically down on the face of the human lung model dummy. The double-headed, white, dotted arrow shows the visible extent of the smoke plume (based on a gray scale of 0 to 255). When scaled up in real dimensions, this arrow represents a real distance of approximately 0.40 m.