K. L. Ivanov, P. K. Madhu, G. Rajalakshmi, Russia) Ivanov, K. L. (International Tomography Center, Novosibirsk, India) Madhu, P. K. (Tata Institute of Fundamental Research, Hyderabad, India) Rajalakshmi, G. (Tata Institute of Fundamental Research, Hyderabad