normalising to ensure we contain 433 and 650 telescopes within a radii of 600 and 1000 m and randomly place the remaining 216 antennas at a radii larger than 1000 m. The total SKA system temperature is modelled as outlined in the SKA System Baseline Design, $T_{\rm sys} = 1.1T_{\rm sky} + 40~{\rm K}$.

The [<span style="font-variant:small-caps;">21CMFAST</span>]{} pipeline {#sec:pipeline}
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Eventually [<span style="font-variant:small-caps;">21CMMC</span>]{} will be performed on actual observations. However for this proof-of-concept, we first create mock observations of the cosmic [EoR]{} signal and generate sensitivities for various instruments[^12]. Using [<span style="font-variant:small-caps;">21CMFAST</span>]{}, we perform a high-resolution, large-box realization of our fiducial [EoR]{} model, simulated within a 500$^{3}$ cMpc$^{3}$ box with an initial grid of 1536$^{3}$ voxels smoothed on to a 256$^{3}$ grid. We then calculate the 21 cm PS from this simulation at several different redshifts and compute the total noise contribution from thermal and sample variance using [[21]{}<span style="font-variant:small-caps;">cmsense</span>]{}. In addition to the thermal noise and sample variance, we add an additional uncertainty due to EoR modelling, accounting for, e.g. differences in the implementation of RT [e.g. @Iliev:2006p3393] and errors in semi-numerical approximations [e.g. @Zahn:2011p1171]. In other words, even if we have a well behaved Universe characterized exactly by 