Acknowledgement
This work was supported by the Korea Astronomy and Space Science Institute under the R&D program (Project No. 2018-1-860-00) super-vised by the Ministry of Science, ICT and Future Planning. This work was also supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT; No. NRF-2018R1D1A1B07043944). SJC is very grateful to Dr. Kwang-Il Seon for his help with the adoption of the grid-based technique.
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