deletions | additions       diff --git a/subsubsectionImages_.tex b/subsubsectionImages_.tex  index 8b0d387..13f0a40 100644  --- a/subsubsectionImages_.tex  +++ b/subsubsectionImages_.tex 
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reduction (although sometimes it might create more images in the  process!).  \subsubsection{{\color{red} Basic Command Line}}  {\color{red}  You will be using the command line in xterm. The xterm is a terminal emulator and runs on the UNIX operating system. Your friendly demonstrators will be able to help you should you get stuck with using it. For those who are not familiar, here are some basic command line for this lab:  \begin{itemize}  \item {\tt cd DIR} --- change directory to DIR  \item {\tt ls} --- list directory contents  \item {\tt mkdir DIR} --- make directory named DIR  \item {\tt cp FILE LOCATION} --- copy FILE to LOCATION  \item {\tt pwd} --- print current working directory  \end{itemize}  }  \subsubsection{{\color{red} Another section?}}  First, log in to the linux computer as {\tt part3} (the password will  be available in the lab). You will end up with a screen with an xterm  in the middle. {\color{blue}  The xterm runs on the UNIX operating system, and your friendly demonstrators will be able to help you should you get stuck  with using it. If you type {\tt ls} you will get a listing of the  current directory. directory.}  You should see a directory called {\tt originals} -- this is where all the relevant images are kept. Please do not alter  these! Instead create your own directory (I've used the name {\tt  bob}, but you can be more creative!) and copy them into it: 
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number of keys that can be pressed to examine it:  \begin{itemize}  {\color{blue}  \item {\tt l} --- produces a plot of the intensity of the line the cursor is  currently on.  \item {\tt c} --- as for {\tt l}, but for the current column.  }  \item {\tt s} --- produces a 3-D surface plot of the region surrounding the  cursor.   \item {\tt e} --- produces a contour plot of the region surrounding the