Fig. 2

a Manual measures derived from three varying wells—red bar indicates manual root length estimations. Green ticks indicate approximate boundaries for quartile divisions—Q0 at the top, Q3 at the bottom. Comparison of manual and automatically derived measures for these wells can be seen in Table 1 and panel. Note the subjective judgment required for root length in the left hand well. b Manual length plotted against proxy-depth for a mixed population of plants in 184 wells. To note in the graph, some of the plants had reached the bottom of the wells, represented at the cluster at (1400, 700)