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The authors also mention that the lower detection limit was 0.3 pg mL−1 (S/N=3). A magnified calibration plot showing the change in the signal in the pg mL−1
range should definitely be presented anywhere. The authors should have such data because they calculated the detection limit.
Also, it would be very helpful to show response curves for concentrations near the detection limit with a change in the background signal to demonstrate that the concentration of 0.3 pg mL−1 can be measured without any problems.
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The authors should have such data because they calculated the detection limit.
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