deletions | additions       diff --git a/Now_its_time_time.tex b/Now_its_time_time.tex  index 9084312..906862e 100644  --- a/Now_its_time_time.tex  +++ b/Now_its_time_time.tex 
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star. {\color{blue}Ask your demonstrator how to extract the column   containing the pixel values, and transfer them across to the Excel on  a Windows PC.}  {\color{red}Run {\color{red} A perl script has been provided for you, which will extract this information. Run  \begin{verbatim}  > ../extract_params.pl OUTPUT.FILE  \end{verbatim}