diff -r fed9320bfbd2 -r c9ba4c828051 docs/data_processing/introduction.rst
--- a/docs/data_processing/introduction.rst	Tue Mar 11 14:51:07 2014 +0200
+++ b/docs/data_processing/introduction.rst	Wed Mar 12 09:58:25 2014 +0200
@@ -25,6 +25,9 @@
    The following discussion assumed that you have already set-up the system 
    settings in the "Admin" section (see :ref:`administration` for details).
 
+Upload a measurement
+~~~~~~~~~~~~~~~~~~~~
+
 In order to start processing lidar data, you will need to upload them 
 on the SCC server. The files should be in netcdf format, following the 
 specific format described in :ref:`netcdf_file`. There is no restriction imposed
@@ -45,23 +48,85 @@
 common problems in the file. If some errors are found, the file will be 
 deleted from the server.
 
+
+Ancillary files
+~~~~~~~~~~~~~~~
+
 If ancillary files are needed for the processing two things should be done:
 
-#. The ancillary file names should be defined in the submitted netcdf file. In 
-   contrast to the measurement files, the file name of the ancillary files
-   should follow a specified format, described in :ref:`netcdf_file`. In brief,
-   a sounding file should have a name rs_YYYYMMDDccNN.nc, a overlap file a name
-   ov_YYYYMMDDccNN.nc, and a lidar ratio file a name lr_YYYYMMDDccNN.nc, where
-   YYYY is a year, MM is the month, DD is the day, cc is the earlinet station 
-   call sign and NN is a number.
+#. **The ancillary file names should be defined in the submitted measurement 
+   file**. In contrast to the measurement files, the file name of the ancillary 
+   files should follow a specified format, described in :ref:`netcdf_file`. In 
+   brief, a sounding file should have a name rs_YYYYMMDDccNN.nc, a overlap file 
+   a name ov_YYYYMMDDccNN.nc, and a lidar ratio file a name lr_YYYYMMDDccNN.nc, 
+   where YYYY is a year, MM is the month, DD is the day, cc is the earlinet 
+   station call sign and NN is a number.
 
-#. The ancillary files should be uploaded on the server. The uploading can be
+#. **The ancillary files should be uploaded on the server**. The uploading can be
    done in the same form as before, or independently in the "Upload ancillary"
    form. If an ancillary file required by a measurement is not present in the
    database, this file will appear as "Missing" and the processing of the 
    measurement will not start and will be marked as "pending". When the missing 
    file is uploaded, its status will change to "OK" and the measurement will be 
    processed.
-  
+
+
+Monitor processing progress
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+When uploading finishes successfully, you will be transfered to the 
+**measurement status page**. There you can monitor the progress of the 
+processing through the status symbols. The three symbols correspond to the 
+phase of processing:
+
+Uploading
+   It indicates if everything needed for processing is provided; practically
+   this indicates if  the measurement file and all needed ancillary files have 
+   been uploaded.
+
+Preprocessing
+    This indicates the progress of the preprocessor module.
+    
+Optical processing
+    This indicates if progress of the optical processing module (ELDA).
 
 
+These three indicators currently support four states:
+
+Gray (Not started)
+    A gray indicator means that the process did not start yet.
+
+Orange (In progress)
+    An orange indicator means that the process is currently performed.
+
+Green (Success)
+    A green indicator means that the process finished successfully.
+
+Red (Fail)
+    A red indicator means that the process failed.
+
+
+While the processing is in progress the page will automatically refresh every
+10 seconds.
+
+
+View output
+~~~~~~~~~~~
+
+When the processing of your measurement finishes successfully, you can browse 
+and download the results.
+
+To **browse** the results, you must select the "Output" tab at the bottom part 
+of the page. There you will find links to view graphs of the resulting optical
+products.
+
+To **download** the results, you can use the links on the "File actions" 
+submenu. Depending on the state of the processing you can downlaod 
+*preprocessed singals*, *optical products*, and *optical product plots*.
+
+
+
+
+
+
+