Affiliation: | a Department of Fundamental Electricity and Instrumentation, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussel, Belgium b Department of Earth System Sciences and Analytical and Environmental Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussel, Belgium c Division of Automatic Control, Department of Electrical Engineering, Linköping University, SE-581 83 Linköping, Sweden |