tokens: The authors thank the anonymous referee for helpful comments on the manuscript. Hinode is a Japanese mission developed and launched by ISAS/JAXA, with NAOJ as domestic partner and NASA and STFC (UK) as international partners. It is operated by these agencies in co-operation with ESA and NSC (Norway). L.-M. Yan thanks H. Peter, Y. Chen, B. Li, L.-P. Yang, and L. Zhang for helpful discussion. The group from Shandong University was supported by grants NSBRSF 2012CB825601 and NNSFC 41274178. The group from Peking University was supported by NNSFC under 41174148, 40890162, and 40931055.
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