Figure 3: Density dependence.

Sum of detected atoms in s and states, versus the initial n=35 Rydberg atoms density for a transfer time of  μs at a fixed electric field of 3.60 V cm⁻¹ for the two-body FRET (black dots) in bi-logarithmic scale. Two fits check the quadratic behaviour in the low density regime (red dotted line) and the linear saturation in the high-density regime (orange dashed line). A second set of data are taken at 3.80 V cm⁻¹ for the three-body FRET (grey dots) and a fit checks the expected cubic behaviour (blue dotted dashed line). The result and the standard error of each fit is presented in the legend. The data range used for each fit is demarcated by couples of vertical lines with corresponding colour and style.