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\subsection{Flux calibration}  \label{sec:fcalib}  The FLOYDS spectra are flux calibrated using the {\em iraf} task  \emph{standard}, \emph{sensfunction} and \emph{calibrate}. The  standard frames are automatically identified from the coordinates and  compared with their tabulated values. The FLOYDS spectrograph  sensitivity functions have a specific shape in the second order with  two deep absorptions around 3800 \AA{} and 4400 \AA{} (see Fig.  \ref{fig:sensblue}). In order to reproduce this specific shape, the  FLOYDS pipeline computes the sensitivity function in two steps: a first  step with the full second order range (3000-6000 \AA{}) is fitted with  a low order function (usually 10-12), and a second step is focused on a  smaller window with a higher order in order to reproduce the two deep  absorptions. The two blue sensitivity functions are then merged into a single sensitivity function. Because of this, specific standards with a dense and  wide coverage of tabulated flux are required. The standard stars that are usually  used for FLOYDS are reported in Table \ref{tab:specphotstandards}.  The 2D frames (2df) after being flux and wavelength calibrated have  the following units: $10^{-20}$ erg\,cm$^{-2}$\,s$^{-1}$\,\AA$^{-1}$  \begin{table}  \label{tab:specphotstandards}  \begin{tabular}{lcccccl}  \hline  Standard Name & RA (FK5, J2000) & DEC (FK5, J2000) & Proper motion (mas/yr) & V mag & Sp. Type & Instrument \\\hline  % VMA2 & 00 49 09.902 & $+$05 23 19.01 & 1236.90, $-$2709.19& 12.374& DZ8 & \\   % L745-46a & 07 40 20.79 &$-$17 24 49.1 & 1129.7, $-$565.7 & 12.98 &DAZ6 & \\   GD71 & 05 52 27.614 &$+$15 53 13.75 & 85, $-$174 & 13.032 &DA1 & FTS/FTN \\  LTT 3218 & 08 41 32.50 & $-$32 56 34.0 & $-$1031.7, 1354.3 & 11.85 & DA5 & FTS \\  % LTT3864 & 10 32 13.603 &$-$35 37 41.90 & $-$263.7, $-$8.0 & 11.84 &Fp... & \\  GD153 & 12 57 02.337 &$+$22 01 52.68 & $-$46, $-$204 & 13.35 &DA1.5 & FTN \\  BD+28d4211 & 21 51 11.07 & $+$28 51 51.8 & & 10.47 & & FTN \\  BD+75d325 & 08 10 49.31 & $+$74 57 57.5 & & 9.51 & & FTN \\  Feige34 & 10 39 36.71 & $+$ 43 06 10.1 & & 11.12 & & FTN \\  G191-B2B & 05 05 30.6 & $+$52 49 54 & & 11.781 & & FTN \\  HZ43 & 13 16 22.0 & $+$29 05 57 & & 12.914 & & FTN \\  EG274 & 16 23 33.837 & $-$39 13 46.16 & 76.19, 0.96 & 11.029 &DA2 & FTS \\   EG131 & 19 20 34.923 & $-$07 40 00.07 & $-$60.87, $-$162.15& 12.29 &DBQA5 & FTS \\   LTT 7379 & 18 36 25.941 & $-$44 18 36.93 & $-$177.05, $-$160.31& 10.22& G0 & FTS \\   LTT 7989 & 20 11 12.08 & $-$36 06 06.5 & 522, $-$1691 & 11.5 & M5V & FTS \\  Feige110 & 23 19 58.398 & $-$05 09 56.16 & $-$10.68, 0.31 & 11.5 & sdO & FTS/FTN \\  \hline  \end{tabular}  \end{table}  \subsection{Checking wavelength calibration}  \label{sec:checkwave}  Both automatic and interactive reductions include a  check of the wavelength calibration using the sky lines or  telluric adsorptions. This is computed by cross-correlating the sky lines either  with a frame of sky lines observed in the past, or the telluric  adsorptions with a telluric model. These frames are stored in the  directory ``{\it standard}". If the check on the wavelength calibration  is performed on 1D frames, the third dimension of the file (produced  by the iraf task $apall$ is used. If the check is performed on 2D wavelength calibrated frames, a median along the spatial axis is used. During the interactive reduction some  plots are shown to the user for feedback. An example of these plots is  shown in Fig. \ref{fig:check}.  \subsection{Fringing correction}  \label{sec:fringing}  At the moment fringing correction is only applied to the red part of  the spectrum. A KEYWORD is added to the science frame if the fringing  correction is applied. Science frames with name starting with `{\it  n}' have been corrected for fringing. While reducing the data in  interactive mode, if the correction for fringing is poor, users may  try to use the option \emph{-- fringing 2} and check if this improves  the fringing correction. The KEYWORDs identifying the flat field used  to correct for fringing are reported below.  \begin{small}  \begin{verbatim}  FLATRED = 'flat_20130401_R642_56463.fits'   FLATBLUE = 'flat_20130401_R642_56463.fits'   \end{verbatim}  \end{small}