deletions | additions       diff --git a/Now_its_time_time.tex b/Now_its_time_time.tex  index 6a95010..17a9b39 100644  --- a/Now_its_time_time.tex  +++ b/Now_its_time_time.tex 
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where $c$ is a constant which we're going to determine.   {\color{red}In practice, this equation is usually rearranged to give:   \begin{equation} m =-2.5\log(f)  -2.5\log_{10}(f) + c. \end{equation} Derive this form.}   For two