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tokens: The anonymous referee is thanked for their very insightful and constructive comments and suggestions, which allowed us to improve the manuscript significantly. We are very grateful to the Tibet AS- γ collaboration for providing their CR maps in electronic format and especially Dr. Yi Zhang for helping us in understanding the data. We acknowledge the use of LAMBDA, support for which is provided by the NASA/GSFC, the software packages HEALPix ( http://healpix.sourceforge.net/ ), developed by A.J. Banday, M. Barthelmann, K.M. Gorski, F.K. Hansen, E. Hivon, and B.D. Wandelt, and CAMB ( http://camb.info ), developed by A. Challinor and A. Lewis. SNZ acknowledges partial funding support by Directional Research Project of the Chinese Academy of Sciences under project No. KJCX2-YW-T03 and by the National Natural Science Foundation of China under grant Nos. 10821061, 10733010, 10725313, and by 973 Program of China under grant 2009CB824800.