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Fig. 4

Fig. 4 Refer to the following caption and surrounding text.

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Histogram of the slopes that quantify the signal stability in a data acquisition of 1 minute. Each count is defined as a function of the slope obtained from linear fitting. The slope values span a range of ~ −2.5–0.5 mV/min for the diode ON case, indicating a lack of significant stability issues within 1 minute of integration.

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