Mean μ_j (eq. 6) of the dominant Gaussian kernel (maximum α_j in eq. 5), labelled μ_dom in the figure, versus the true synthetic value for all patterns in the test data set for the 22 V_P parameters (Tables 1 and 2). The regions between discontinuities are displayed on different rows. For every region, depth decreases from left to right in the figure. The corresponding correlation coefficient R is given above each frame.