Extended Data Fig. 2: Example biofilm and contour identification.

(a) Raw image showing the basal plane (top) and cross-section (bottom) of a WT* biofilm grown under a 0.5% agarose gel. Scale bar, 10 µm. (b) Three-dimensional reconstruction of the biofilm in (a) with the areal convex hulls overlain (white). (c) Effective radii of the convex hulls as a function of the height of the biofilm. Red line corresponds to a linear fit from which the effective contact angle is calculated.