Fig. 4.

(a) Autocorrelation functions $C(q,\tau )$ measured for a $L=413\mathrm{\mu }\mathrm{m}$ spheroid, with a delay going from $6$ to $24\text{min}$ (markers). Data was fitted (lines) using Eqs. (4), 3 and 11. Fitting parameters are $\sigma =0.79\mathrm{\mu }\mathrm{m}$, $1.40\mathrm{\mu }\mathrm{m}$, $2.16\mathrm{\mu }\mathrm{m}$ and $2.87\mathrm{\mu }\mathrm{m}$. (b) Cell displacements magnitude distribution ($D(\mathrm{\Delta }r,\tau$) multiplied by $4\pi |\mathrm{\Delta }r{|}^2$) deduced from the fit of (a). (c) Phase function $p$ measured for a spheroid of 146 µm in diameter, averaged azimuthally. Data was fitted using Eqs. (4) and 8. (d) Mean cells speed inside spheroids as a function of the pressure applied, for spheroids of respectively $250\mathrm{\mu }\mathrm{m}$ and $470\mathrm{\mu }\mathrm{m}$ in diameter (markers). Data was fitted by an exponential decay (lines).