Fig. 1. The relationships between the measured values and the expected values. (A) Each measured value is precise, and both the measured values and the expected values show a straight linear trajectory; (B) Each measured value is not precise and does not show a straight linear trajectory, but is it is close to the expected values; (C) Each measured value is not precise, but the mean values are close to the expected values and show a straight linear trajectory. Blue dots represent the measured values from the duplicate measurements, and red dots represent the expected values by the calculation using the ratios of low and high-level samples.

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