Table 6: Outputs from contingency tables for the three pairings of methods (visual vs Vayu, visual vs Zenmuse and Vayu vs Zenmuse) quantifying agreement (proportion of warrens where the imagers agree on presence or absence of warrens), False Nil (the proportion of warrens where imager “1” detected entrances but imager “2” detected zero entrances) and False Presence (The proportion of warrens where imager “1” detected zero entrances but imager “2” detected at least 1 entrance) between the methods.