We will now take a closer look at one section of the frequency band (Figure 3). The resonance peak around 3 GHz decreases
in intensity and the resonance frequency shifts until a mesh density of 330.000 nodes is used where an extremely high
accuracy is attained (pass 9). The difference between the absolute minimum of these peaks for runs 1 and 9 is, nevertheless,
25 dB, the frequency shift 330 MHz. A renewed look at the results submitted by the benchmark participants, clearly reflects the
time spent and reliability of the various methods. The difference between the individual resonance peaks amounts to 12dB /
250 MHz for this frequency range. This enormous difference impressively clarifies the importance of a carefully carried out
convergence study. It should be noted that the 9 runs made here, were only carried out in order to clearly illustrate the
convergence process. In practice, substantially fewer runs are sufficient to reach a reliable result.