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![Working principle of the Pulse oximeter (SpO2) [35] | Download Scientific Diagram](https://www.researchgate.net/publication/354161165/figure/fig6/AS:1061283847749673@1630041195508/Working-principle-of-the-Pulse-oximeter-SpO2-35.png "Working principle of the Pulse oximeter (SpO2) [35] | Download Scientific Diagram")