This expression has a maximum when α = 1, and is symmetric about this point. This corresponds to 'conventional' NUWS (Fig. , green), in which the resolution enhancement is applied directly through the number of scans, and the apodization function h(t) ≈ 1 (the approximation reflecting compensation for the integer sampling weights). The gain in sensitivity per unit time, relative to uniform sampling, may be calculated from Eq. 5 and is dependant only on the product ΓT :