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\subsection{Flux calibration}  \label{sec:fcalib}  The FLOYDS spectra are flux calibrated using the {\em iraf} 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 Figs. \ref{fig:sensblue} and \ref{fig:sensblue2}). 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$^{-1}$ erg cm$^{-2}$ s$^{-1}$ \AA$^{-1}$  \begin{table}  \begin{tabular}{lcccccl} 
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\hline  \end{tabular}  \caption{FLOYDS Spectrophotometric Standard Stars\label{tab:specphotstandards}}  \end{table}