Fig. 4

Three representations of the multistationarity region of the network in Fig. 3a after fixing all parameter values other than \(k_3\) and \(k_8\) to the values in (1). a CAD gives the exact boundary of \(L_1(\Phi _f^0)\) and \(L_3(\Phi _f^0)\). The first one is colored by sky blue and the later one with yellow. b A sampling representation of the parameter region \(B=[(0.0005,0),(0.001,2)]\) by 1000 random points sampled from uniform distribution on B. 78 of these points belong to \(L_3(\Phi _f^0)\) and are colored yellow. The other 922 points belong to \(L_1(\Phi _f^0)\) and are colored by sky blue. c A rectangular representation of B. Each subrectangle is colored with respect to the average number of solutions for 10 random points sampled from the uniform distribution on the subrectangle. The color bar of the figure is in the right side