tokens: We thank the anonymous referee for detailed comments. This work is supported by the Ministry of Science and Technology, Taiwan, through grants MOST 105-2119-M-007-029-MY3 and 106-2112-M-007-006-MY3. Software: IPython (Pérez Granger 2007 ), Matplotlib (Hunter 2007 ), NumPy (van der Walt et al. 2011 ), SciPy (Jones et al. 2001 ), SymPy (Meurer et al. 2017 ).
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