Comparison between the expected and the recovered (mean of Monte Carlo realizations) pressure fluctuation power spectra. The bias, shown at the bottom of each panel, is defined as the ratio between the two and we show the ±10% interval as a dashed line. Error bars correspond to the uncertainties on the mean associated with the variability of Monte Carlo realizations. Top: comparison after projection only, i.e. we are testing the validity of Equation 13. The bias is larger than a factor of 1.3 only for the lowest bin for the blue curve, at scales well above the peak. Bottom: comparison when including projection effects, the instrument response function and masking, i.e. we are testing the framework discussed in Section 4. The labels A10MD and A10CC refer to the morphologically disturbed and cool-core pressure profile models of Arnaud et al. (2010), respectively.