Fig. 4

Polar dB diagram of the scattered field at \(r=1.5R_{in}\) for \(M_\infty = 0.1\) with \(\Delta r=0.5dB\), and \(M_\infty = 0.3\) with \(\Delta r=1dB\). Effect of \(\sigma _{T}\): comparison between Taylor’s operator isolation method in Eqs. (12) and (13), and the metric tensors formulation in Eq. (16).