Model 1 power spectrum estimates for three triads (see inserts). The top panel shows power spectra estimated from visibilities (solid blue line) and closure phases (black scatter points). The dotted orange line shows the closure phase power spectrum for a sky consisting of foregrounds only. The lower panel shows the fractional difference, ε, between the visibility and closure phase power spectra. The shaded regions mark the foreground wedge. All uncertainties due to cosmic variance are 2σ.