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Data from a series of laboratory experiments show the relationships between measured correlation spectrometer (COSPEC) sulfur-dioxide (SO2) burdens, automatic gain control (AGC) deflections, and visible wavelength opacities in ash-laden plumes. The data show that the COSPEC reliably measures (within a 10% accuracy) SO2 burdens up to AGC deflections of 2V and visible wavelength opacities of 50%. Beyond...