Top: Estimated dynamic range (peak signal divided by noise estimate) as a function of Briggs robust parameter for the W43-MM3 B3 mosaic. Middle: Estimate of the noise as a function of Briggs robust parameter. Bottom: Beam major axis FWHM in arcseconds as a function of the Briggs robust parameter. In all three figures, the lines show the cleanest (blue squares) and “best sensitivity” (bsens; orange circles) data. The noise is estimated in a relatively signal-free region selected from the robust = 0 maps; the rise in noise to higher robust values is partly or entirely caused by added large-scale signal in these regions.