Fig. 3

Bland–Altman plot with logarithmic transformation of the Euclidean distances between the FS and M methods, averaged over 34 landmarks. The x‑axis represents the mean of log(FS) and log(M), and the y‑axis represents the log‑transformed differences (FS − M). The centered dashed blue horizontal line indicates the mean difference (bias), while the dashed red lines represent the 95% limits of agreement. A generally homogeneous distribution of data points within the limits of agreement is observed, with only two values falling outside these limits.