1. Figure 4. Far-field pressure spectra and comparison with Tam's prediction model for both jet Mach numbers and different polar positions.4 -3 -2 -1 0 1 2 3 4 10-410-2100
2. ψ, degrees 20 40 60 80 100 120 140 160 -0.02
3. (p- p )/ p′2 1/2-4 -2 0 2 4 10-510-410-310-210-1100Mj=0.6
4. (p- p )/ p′2 1/2-4 -2 0 2 4 10-510-410-310-210-1100Mj=0.9
5. The authors acknowledge the support of the EU Collaborative project ORINOCO (ACP0-GA-2010-