Dealing with Transients due to Multiple Experiments in Nonlinear System Identification**The authors are with the ELEC Department of the Vrije Universiteit Brussel (VUB),Brussels B-1050, Belgium. The corresponding author can be contacted at the (Rishi.Relan@vub.ac.be). This work was supported in part by the IWT-SBO BATTLE 639, Fund for Scientific Research (FWO-Vlaanderen), by the Flemish Government (Methusalem), the Belgian Government through the Inter university Poles of Attraction (IAP VII) Program, and by the ERC advanced grant SNLSID, under contract 320378.