Affiliation: | 1. Yogi Vemana University, Kadapa, Tirupati, India 2. Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital, 263 129, India 4. Department of Physics, Kumaun University, Nainital, 263 001, India 3. Physical Research Laboratory, Ahmedabad, Navrangpura, 380 009, India
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