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1. The data calibration where the user chooses the spectrum resampled in wavelength (default case) or the s2d image. In the latter case, the user should not select any function from the data processing field.
2. The data processing where the user chooses the functions and the related parameters to be processed.
   Four functions can be processed, the "Resampling", "Flux calibration", "Flux normalisation" and "VSG" functions:
   
   1. The "Resampling" function allows the user to resample the spectrum in wavelength by choosing the following parameters: the wavelength interval in Angstrom [Wstart,Wend], the wavelength step (Wstep) and the wavelength scale (linear or logarithmic). The command code is wrs[1,Wstart,Wend,Wstep]. Warning: the selection of a restricted wavelength interval or the rebinning of the whole spectrum will cause, at the present time, an indesirable interpolation over the gaps in the spectrum containing any NaNs (bad CCD columns or telluric lines).
      
   2. The "Flux calibration" function provides a flux calibration of the spectrum according to the choice of the user. Two choices are available: an "instrumental flux" calibration (i.e. corrected for detection effects as the flat-field) or a "continuum normalized flux" calibration. The command code is fca[1,ins] or fca[1,nor].
      
   3. The "Flux normalisation" function allows to normalise the spectrum at a given wavelength interval [Wstart,Wend]. The flux scale can be linear or logarithmic. The command code is fno[1,w,Wstart,Wend] for the linear scale and
      and fno[2,w,Wstart,Wend] for the logarithmic scale.
   4. The "VSG" function gives the possibility to shift and/or broaden the lines according to the chosen parameters cz and sigma provided by the user in km/s. The command code is vsg[cz,sigma].
   
   
3. The data evaluation where the user chooses the desired type of output which can be the "statistics" table (number of pixels and lines, mean flux and the RMS), the "header" list and/or the "spectrum". The command code is respectively for each type fs, fd and vs.
   If the s2d image is selected in the data calibration field, the "statisctics" table and the "header" can be visualized and downloaded and the "spectrum" (s2d image) can only be downloaded.

1. The user should choose the parameters of a function BEFORE selecting the function (by clicking on the button associated to the function).
2. The pipeline executes the commands following the order of the selections. Example: If the button "Display spectrum" (in the "data evaluation" section) is selected before the "Flux normalization" function (in the "Data processing" section), then the displayed spectrum will not be normalized, it will be associated to the functions called before (the default function is the resampled spectrum).
3. A command in the "Data evaluation" section can be called more than once (example: the user could choose to view the default spectrum, select a function and view the new spectrum at the same time).
4. If the same function in the "Data processing" section is called more than once with different parameters, the last parameters will be used for the process.
5. If nothing happens after submitting a reduction request, this probably means that user forgot to choose the type of output given in section "Data evaluation".
6. The user can type the commands codes directly in the "Pipeline command".