Just in case anyone is interested in auto-calculate column width, probably 
deal to jgm/pandoc@0dfceda 
<https://github.com/jgm/pandoc/commit/0dfcedad7ef98dfcfdb2378b7c974bf96b93fbcc>, 
the column width should be calculated from the “(actual length of line) + 
3”. Also see default column used in tables? - Google Groups 
<https://groups.google.com/forum/#!topic/pandoc-discuss/OiLX2LF3dC0> in how 
it is reverse-engineered.
​

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