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T(E) = BJD~2450021.77890(6) + E \times 0.0878654291(1)   \end{equation}  \noindent  The corresponding root-mean-square \href{https://en.wikipedia.org/wiki/Root_mean_square}{(RMS)} of the data around the best-fit line is 27.5 seconds and the corresponding standard deviation is 27.7 seconds. As expected they should both be similar.  To measure scatter of data around any best-fit model,  I will use the RMS quantity. 
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