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\subsubsection{{\color{red} Another section?}}  First, log in to the linux computer as {\tt part3} partiii}  (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.} You should see a directory called {\tt originals} originals2014}  -- 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:  \begin{verbatim}  > mkdir bob  > cp originals/*.fits originals2014/*.fits  bob/ \end{verbatim}  Now you want to start IRAF. This stands for {\it Image Reduction and  Analysis Facility}, and is one of the most common tools used for  reduction and analysis of astronomical images, particularly optical  and infrared ones. \textbf{Important:} you must be in the \texttt{iraf} directory to start IRAF.   \begin{verbatim}  > cd iraf  \end{verbatim}  Bring up a new window (of a slightly different type) by typing  \begin{verbatim}