Systematic bias as a fraction of the thermal noise for a simulation with matched sky model DI gain calibration (forward simulation and calibration with a PSO sky model) in the left panel (setup 1) and with a mismatched sky model DI gain calibration (forward-simulation with a PSDE sky model and calibration with a PSO sky model, which is missing the diffuse Galactic foreground component), in the middle panel and right panel (setups 2 and 3). The systematic bias is estimated from ten power spectra under variation of thermal noise (setup 1), diffuse foregrounds (setup 2), thermal noise and foregrounds (setup 3), respectively, in the visibility simulation. Blue regions indicate that the systematic bias is below the estimated thermal noise and red regions above.