One thing that bothers me about this paper: The measurement error is stated to be +/- 6 micro-Newtons. However, the difference between force measured at the sa

One thing that bothers me about this paper: The measurement error is stated to be +/- 6 micro-Newtons. However, the difference between force measured at the same power is 30-40 micro-Newtons and the "measurement error" is listed as the +/- error. So if the measurement error is that low then the additional variation is unreliability of the effect itself or a miscalculation of the measurement error.