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Spectroscopic conversion steps of NIN data time series from one source–detector pair. (A) Raw recorded NIN light intensity data from two wavelengths, in arbitrary units. (B) Data from (A) after log transformation to optical density units. (C) Data from (B) after conversion to hemoglobin concentration units (red = oxy-Hb, blue = deoxy-Hb, yellow = period of task activity).
