Different two-tone scenarios close to saturation are measured and calculated with both the hybrid models and MVTRAD alone. For this, CW output power and absolute phase versus input power (from small signal to 1dB into overdrive in 1 dB steps) and frequency (in 100 MHz steps inside the band of interest) are simulated in MVTRAD beforehand. For the hybrid SGC model, the signals are then evaluated with respect to their frequency content and the center frequency is taken as the model reference frequency. For the other two models, as the possible intermodulation frequencies are known, the TWT data at these frequencies are extracted and taken as reference for the fitting.