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(a) A RBC defocused image. (b) The corresponding RBC contrast profile along the horizontal diameter. The two peaks are due to edge effects that can be taken into account if one uses the integral representation for the defocused electric field of the light, from which the model used in this Letter is a first order expansion.
RBC profile obtained from the integration of the experimental contrast data of Fig. 1(b). The integration is performed up to the data point closest to zero contrast at the increasing part of the peak. This procedure introduces an error of about in the determination of the height of the RBC thickest part, and an overestimation of the RBC radius by about 3%. The difference in refractive index obtained is .
Normalized spatial-correlation function of RBC curvature fluctuations. Dots are the experimental points and the continuous curve is the fit using the theoretical prediction from the Brochard-Lennon model for curvature fluctuations. The characteristic length obtained is for .
Time-auto-correlation function of RBC curvature fluctuations. Dots are the experimental points and the continuous curve is the fit using Eq. (4). From this fit we obtain and . Inset: linear-log plot of the same curve.
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