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tokens: We thank Bill Coles for help with the definition of the goodness-of-fit statistic, for suggesting the adopted method of estimating parameter uncertainties, and for useful discussions on the effects of interstellar scattering, and M. Krishnakumar for providing us with tables of scattering data for Galactic pulsars. We also thank Matthew Bailes, Simon Johnston, J.P. Marquart, and Ryan Shannon for useful discussions, and George Hobbs and Hailong Zhang for help with the YMW16 web interface. Finally, we thank the referee for helpful comments. This work was supported by National Basic Research Program of China (973 Program 2015CB857100 and 2012CB821801), the Strategic Priority Research Programme (B) of the Chinese Academy of Science (No. XDB09000000), the National Natural Science Foundation of China (No. 11373006), and West Light Foundation of CAS (No. ZD201302). We acknowledge extensive use of the SAO/NASA Astrophysics Data System ( http://www.adsabs.harvard.edu/ ) in the preparation of the work presented here.