http://omlc.org/spectra/hemoglobin/ http://omlc.org/spectra/hemoglobin/ Scott Prahl, of the Oregon Medical Laser Center http://omlc.org/spectra/hemoglobin/ http://omlc.org/spectra/hemoglobin/ http://omlc.org/spectra/hemoglobin/ http://omlc.org/spectra/hemoglobin/