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In-vitro validation test setup. (a) A syringe pump pushes a hemoglobin solution through a Digit Analog with a clipped on ATSA instrument. (b) Measured flow index in arbitrary units plotted against volumetric flow in ml per minute. The blue circles show ATSA recordings averaged over 10 seconds while the dotted black line shows a linear fit with an R2 coefficient of 0.98.
