\padding
The amount of padding in the first array is the default value of 1.
\array{ 1 & 2 & 5 & A \\ 3 & 4 & 6 & B \\ \beta & \Gamma & \Theta & \mu \\ 7 & 8 & 9 & G } = \array{\arrayopts{\padding{3}}1 & 2 & 5 & A \\ 3 & 4 & 6 & B \\ \beta & \Gamma & \Theta & \mu \\ 7 & 8 & 9 & G } = \array{\arrayopts{\padding{5}}1 & 2 & 5 & A \\ 3 & 4 & 6 & B \\ \beta & \Gamma & \Theta & \mu \\ 7 & 8 & 9 & G }
\array{\arrayopts{\padding{0}}1 & 2 & 5 & A \\ 3 & 4 & 6 & B \\ \beta & \Gamma & \Theta & \mu \\ 7 & 8 & 9 & G } = \array{\arrayopts{\padding{-0.5}}1 & 2 & 5 & A \\ 3 & 4 & 6 & B \\ \beta & \Gamma & \Theta & \mu \\ 7 & 8 & 9 & G }More information on these commands may be found in Sec. 7.2.1 of the WebTeX documentation.
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