Excess noise in the images compared to the thermal noise level that was requested in the proposal. The top panels show cleanest continuum data, the bottom show bsens. The Y-axis shows the measured noise level in an image with the requested beam (i.e., σ_MAD(Ω_syn/Ω_req)^1/2; see §3.3.3) divided by the requested noise level; higher values indicate higher measured noise. The horizontal dashed line indicates where the measured noise exactly matches the requested noise. The X-axis gives the total flux in the image (left panels) and peak intensity (right panels). We compare the noise to the total and peak flux to search for correlations that may explain the excess noise as deriving from some form of dynamic range limit, but we do not observe any clear correlation. The excess noise is caused by calibration errors, unresolved structure, and other possibilities discussed in Section 3.3.3