Structurally unidentifiable parameters for different configurations of the βIG model.

Each table entry in the four rightmost columns shows the structurally unidentifiable parameters for a given choice of measured outputs (different rows) and parameters considered unknown (different columns). Four representative choices of parameters are studied: (i) with all the model parameters {α, γ, c, p, si} considered unknown, (ii) with the two parameters {p, si} that may exhibit dynamical compensation considered unknown, (iii) with all but p unknown, and (iv) with only one parameter, si, considered unknown.