Table 1.

Root system parameters used as ground-truth data.

Name	Description	Unit
tot_root_length	The cumulative length of all roots	mm
tot_1_order_length	The cumulative length of all root axes	mm
tot_2+_order_length	The cumulative length of all lateral roots	mm
mean_1_order_length	The mean first-order roots length	mm
mean_2+_order_length	The mean lateral root length	mm
n_1_orders	The total number of first order roots	–
n_2+_orders	The total number of lateral roots	–
mean_2+_order_density	The mean lateral root density: for each first-order root, the number of lateral roots divided by the axis length (total length).	mm-1
mean_1_order_diam	The mean diameter of the first-order roots	mm
mean_2+_order_diam	The mean diameter of the lateral roots	mm
mean_2+_order_angle	The mean insertion angle of the lateral roots	°