How to plot the number of open channels as function of the run number

Login as lhcb@ckm

```
 cd /disk/home/hep/lhcb/noise/ 
```

use bash shell

```
 source setupRoot.sh 
```

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

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

Plots will be saved in new folder

 lhcb@ckm:~/noise/VFS400_NOTP/rootFiles/links_ALL/nBadChannels/

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.