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a–d, The reproducibility of the sodium (a), potassium (b), glucose (c) and lactate (d) sensors (eight samples for each kind of sensor). e–h, The long-term stability of the sodium (e), potassium (f), glucose (g) and lactate (h) sensors. Sensitivity is measured in millivolts per decade of concentration. The error bars represent the standard deviations of the measured data for five samples.
