Figure 6

The EIT spectrum shifts versus the SG output power fed to the antenna or the LO port of the resonator at 638 MHz. These data were obtained in the presence of the LO field only and show a clear linear relationship that could be used to infer the E-field strength at the atoms position for different SG output powers. The optimized LO field strength of 4.91 V/m induces a spectrum shift of 3.31 MHz. This shift corresponds to an SG output power of 13.183 mW (when it is fed to the antenna) and 0.0286 mW (when it is fed to the LO port of the resonator). The error bars correspond to the standard deviation of three datasets