Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12918-015-0232-5/MediaObjects/12918_2015_232_Fig4_HTML.gif)
Structural parameters for the toy-model. a Growth rate for different switching parameters, r. Two discontinuities exist in the slope of the curve at r=0.25 and r=0.5. b Pathway length vs. r. c Number of nodes vs. r. d Number of reactions vs. r. Structural parameters of the optimized network confirm that only r=0.25 is a structural transition