Fig. 7
Frequency-wise relative errors between the estimated and the true external SH coefficients for different modes. The columns show the RMS errors using full-VP (left), alt-Fibonacci (middle), and alt-\(\infty\) (right), respectively. Different rows are for different SH modes, i.e., (1, 0) (top), (2, 1) (middle), and (2, 2) (bottom). In each plot, the RMS errors are color-coded by the iteration number