*A*, example Neurolucida reconstructions of pairs of dendritic tufts for each of the three lateral transmission directional groupings. *B*, graphs showing the relationship between the total number of branch points (*Ba*), surface area (*Bb*) and convex Hull surface (*Bc*) and the amplitude of lateral transmission (bi-directional (both directions plotted), *n* = 8 connections (green circles); uni-directional (a single direction plotted), *n* = 10 (blue circles); neither direction (a single direction plotted), *n* = 4 (orange circles); total, *n* = 22 connections from 18 pairs). *C*, comparison of the average morphometric properties of both reconstructed tufts per pair (*n* = 18 pairs) to those from individual cells that did not project their apical dendrites to the same glomerulus (non-pairs; *n* = 12 cells, each tuft multiplied by a factor of 2; error bars correspond to standard deviation). *D*, in a subset of pairs lateral dendrites (*n* = 5) were also reconstructed (inset bottom). *Da*, a plot showing the minimum distance bin (bins were 0.1 μm wide; lower bin limit plotted – see Methods) obtained from a histogram of dendritic distances (•, apical tuft; ○, lateral dendrites). *Db*, a plot showing the amplitude of lateral transmission for pairs where lateral dendrites were reconstructed (rec. laterals, *n* = 5 pairs), all pairs where the tufts were reconstructed (rec. pairs *n* = 18 pairs) and for the entire data set (all pairs, *n* = 99 pairs; bars correspond to standard error).

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