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. 2016 Jun 29;6:28928. doi: 10.1038/srep28928

Figure 3. Calibration of the concentration measurement using the standard methylene blue solution samples.

Figure 3

The black round points represent the absorption results given by the commercial UV-Vis spectrophotometer, while the red half hollow square points by our device. The corresponding transmittance is also plotted using the blue solid square points. a.u. denotes arbitrary unit. I is the transmitted intensity, and I0 is the incident intensity.