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  • Thank you. What is the difference between the lower and upper case c's anyway? Commented Apr 23, 2013 at 19:03
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    @David: The difference is the case, and LaTeX (like many programming languages) use a case-specific interface. So, just like you use \sin and not \Sin or \SIN. There is a difference, since LaTeX expects a lowercase l, c, r, p by default. tabularx provides an additional X, while array adds m and allow expansion of the defaults to your liking. Commented Apr 23, 2013 at 19:05