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Table 3 Comparison of observed and expected spatial distributions based upon the capture-zone model

From: The mechanisms responsible for 2-dimensional pattern formation in bacterial macrofiber populations grown on solid surfaces: fiber joining and the creation of exclusion zones

Population examined   Ratio of measuring/ capture-zone square size1 Number of grid squares containing structures Chi-square  
    0 1 2 33   p
97–86 obs2 3 15 40 38 10 0.97 0.81
3 df4
  exp2   13.0 38.7 38.5 12.8   
97–142 obs 2 19 57 26 2 1.10 0.58
2 df
  exp   21.5 52.0 31.2 0   
916–150 obs 2 32 56 16 2 0.66 0.72
2 df
  exp   32.8 52.3 20.8 0   
916–444 obs 2 45 49 11 1 0.076 0.96
2 df
  exp   44.9 48.2 12.9 0   
920–125 obs 2 27 54 23 2 0.113 0.95
2 df
  exp   26.5 53.0 26.5 0   
920–400 obs 3 36 47 22 1 1.39 0.71
3 df
  exp   37.0 46.6 19.6 2.7   
  1. 1. The minimum link length (Y intercept from Table 2) from each population was used as as a guide to the length of a side of the capture zone square. The measuring square side length from Figure 6 was 5.5 mm for all populations. Ratios of 2 and 3 were chosen for illustration purposes with no attempt to optimize the fit to observed values. 2. exp are values predicted by the capture zone model, obs are values from Table 1. 3. Squares containing 4 (1), 5 (2) and 6 (1) are included for population 97–86. 4. df are the degrees of freedom used to obtain the p values above them.