My name is Srinath and I am doing my PhD in National University of Singapore.

Recently I came across an titled “Curvature-based methods for designing optimally informative experiments in multiresponse nonlinear dynamic situation” L. Bennabas, S.P. Asprey and S. Macchietto,IECR, 2005, 44, 7120-7131

I’ve a question regarding the contours of the likelihood surface (Fig 4 in that article). I want to know if you’ve come across such drawings and if yes, how to draw these figures (the logic behind it)

I would highly appreciate your reply and help in this regard.