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Spectral properties of the materials and optical components used in the multi-analyte sensor: a the absorption spectra of the pCO2 and pO2 probes; b the emission spectra of the same probes; c the absorption spectra of the pH and temperature probes; and d the emission spectra of the same probes. For convenience, the emission spectra of the LEDs and the transmittance spectra of the optical filters are also shown within on same scale
