tokens: Acknowledgments J-SN and J-NF acknowledge the support from the Joint Fund of Astronomy of National Natural Science Foundation of China (NSFC) and Chinese Academy of Sciences through the grant U1231202, the NSFC grant 11673003, the National Basic Research Program of China (973 Program 2014CB845700 and 2013CB834900) and the LAMOST FELLOWSHIP supported by the Special Funding for Advanced Users, budgeted and administrated by the Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS). J-SN thanks Nami Mowlavi for helpful discussions and useful advice.
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