Fig. 6.

Root tracing errors in the database. The analysis of the frequency of errors shows the most common types of errors are due to “short cut” and “convergence” errors, which allow for multiple possible root tracings. Other errors are due to “wrong associations” between seed and root tip or the “misadjustment” of a marker for a root tip causing (1) large errors when a neighbouring root is traced (“misplacement”), or (2) small errors when the correct root is traced but the marker is placed either on a root, but not on the root tip, or not on a root