A method of and system for producing a digital image of an object with reduced speckle-pattern noise power. The viruses can be harvested and be used for the production of vaccines. The transfer function uses the temperature difference values to correct pressure frequency readings for temperature transient errors. A second fiberglass-based facer that is substantially impervious to the passage of hot gases of combustion through its thickness can form a bottom major surface of the composite. The metal sheath has a porous outer tissue ingrowth surface and a roughened inner surface. In a further embodiment, the graphics engine may operate in both modes.