1. Chaos and Complex Systems Research Laboratory, Department of Physics, University of Burdwan, Burdwan 713 104, West Bengal, India
2. Department of Physics, Bankura University, Bankura 722 155, West Bengal, India
3. Potsdam Institute for Climate Impact Research, Telegraphenberg, Potsdam D-14415, Germany
4. Department of Physics, Humboldt University, 12489 Berlin, Germany