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====== How to plot the number of open channels as function of the run number ======
   * Login as lhcb@ckm

   * <code> cd /disk/home/hep/lhcb/noise/ </code>

   * use bash shell

   * <code> source setupRoot.sh </code>

   * Go to the directory where the files (or the symbolic links) are located, e.g.: <code>lhcb@ckm:~/noise/TEST/symLinks></code> 

   * Use the script <code>/disk/home/hep/lhcb/noise/scripts/nBrokenBonds.py</code> E.g: <code>./../../../scripts/nBrokenBonds.py</code> If no arguments are passed to the script, the usage will be explained!

   * Plots will be saved in new folder <code> lhcb@ckm:~/noise/VFS400_NOTP/rootFiles/links_ALL/nBadChannels/</code>


=== How to create a selection of datafiles only ===
   * Create symbolic links to the datafiles in a new folder and run the script nBrokenBonds.py there.
      * E.g. of folders containing links: ~/noise/symLinks.
     
=== How to create many symbolic links  ===
   * Create a text file containing all the rootfilenames (e.g: ls > files_2010.txt)
   * Delete filenames you do not want in the selection
   * run the script createSymLinks.sh in the directory that will contain the links   

=== How to add data files to existing selection ===
To add links (to new root files) to an existing selection do:

   * Copy the new root files into the folder containing the existing ones.
   * Create a text file containing ALL the rootfilenames (e.g: ls > files_2010.txt) you want to select.\\
   * run the script createSymLinks.sh in the directory containing the links. New ones will be added.

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