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tokens: R.S. acknowledges financial support under the research grant SR/FTP/PS-058/2012 by SERB, DST, and from IISER Bhopal. P.K.A. is supported by the Claude Leon Post-doctoral Fellowship program of the Claude Leon Foundation, South Africa, at UCT. We use the publicly available HEALPix (Górski et al. 2005 ) package available from http://healpix.sourceforge.net to perform forward and backward spherical harmonic transformations and for visualization purposes. We acknowledge the use of the Legacy Archive for Microwave Background Data Analysis (LAMBDA). LAMBDA is a part of the High Energy Astrophysics Science Archive Center (HEASARC). HEASARC/LAMBDA is supported by the Astrophysics Science Division at the NASA Goddard Space Flight Center.