analysis yielded projected rotational velocities for the components of V2653Oph as $v_{\rm P}\sin i$=25 kms$^{-1}$, and $v_{\rm S}\sin i$=20 kms$^{-1}$. The mean deviations were 1 and 2 kms$^{-1}$, for the primary and secondary, respectively, between the measured velocities for different lines.

In Fig.2 we show the simulation of the spectrum of the system with that of broadened combination of the two standard spectra at phase 0.72 (HJD 54647.37993) using the derived rotational velocities. The spectral order at blue wavelength is displayed. The sum of residuals is also shown, as a function of $v\,sin\,i$, in the insets of Fig2.

  ------------------------ ---------------- --------------- -- -- -- -- -- -- --
  Parameter                                                                   
                               Primary         Secondary                      
  Spectral type             F(2$\pm$0.5)V    F(7$\pm$0.5)V                    
  $T_{\rm eff}$ (K)          6950$\pm$480    6350$\pm$650                     
  $\log~g$ ($cgs$)          4.07$\pm$0.02    4.22$\pm$0.06                    
  $v\sin i$ (kms$^{-1}$)       25$\pm$1        20$\pm$2                       
  $[Fe/H]$ (dex)            -0.11$\pm$0.08   0.07$\pm$0.09                    
  ------------------------ ---------------- --------------- -- -- -- -- -- -- --

  : Spectral types, effective temperatures, surface gravities, metallicity and rotational velocities of components estimated from the spectra of V2653Oph.

We also performed a spectral classification for the components of the system using the COMPO2, an IDL[^3] code for the analysis of high-resolution spectra of eclipsing binary systems originally written by @Frasca2006 and adapted to the [REOSC]{} spectra. 