# Changes required by the referee.
- p.02; Added the Table 1 which contains a brief summary of the orbital elements and properties of components of xi Tauri.
- p.02; Added few lines introducing the Table~1.
- p.14; Refined comment regarding the component~C at the beginning of Sect.~7.
- p.15; Re-computed the total mass of the system from the astrometry using our estimate of the parallax based on the spectroscopy and interferometry. Computed a new estimate of the mass of component C (m^c = 1.61 +/- 1.18), which is closer to the expected spectral type and commented it in the text. 
- p.26; Added reference to Table~10 conatining orbital elements of orbit~3 in, and to mass esimate of component C to the caption of Table~12.

# Changes NOT required by the referee.
- p.01; Minor changes in the order of co-authors were made. Few affiliations were corrected.
- p.01; Abstract; removed (vi), because it has been mentioned in (iv).
- p.01; A footnote acknowledging the use of observations from the satellite MOST was added.
- p.03; Completely rewritten the caption of Figure 1 to make it more clear.
- p.03; Changed "three optical (spectro)-interferometers" --> "four spectro-interferometers", because AMBER works in the infrared.
- p.03; The text now correctly refers to details on the spectro-interferometric observations in Appendix~C.
- p.04; Changed "contains a number" --> "is covered with a number". 
- p.05; Fixed reference to Sect. from 8.1 to 8.
- p.05; Fixed incorrect estimate of the LITE amplitude produced by orbits~2 and 3.
- p.08; Fixed notation of spectral ranges from \lambda1 --> \lambda_1; \lambda2 --> \lambda_2, ...; The same in Table~7 and Figure~4.
- p.08; Table~8 changed km/s -> km s^{-1}.
- p.08; Table~8 changed unit from Kelvin (K) to kiloKelvin (kK) to fit the Table within one column.
- p.11; Figure 6 notation of the orbital frequency of orbit~1 was changed from 1+2 to Aa+Ab.
- p.11; Fixed reference to Sect. from 8.1 to 8.
- p.11; Fixed reference: "although Sects. 8.1 and 9 show" --> "although Sect. 8 show"
- p.12; Fixed unit "HJD" --> "RJD".
- p.13; Included "forgotten AMBER": "three instruments, i.e. CHARA/VEGA, NPOI, MARK\,III, and VLTI/AMBER" --> "four instruments, i.e. CHARA/VEGA, NPOI, MARK\,III, and VLTI/AMBER"
- p.13; In Eq. 9 added suffix "S" to the visibility an closure phase to emphasise, that it is a synthetic value. 
- p.13; In Eqs. 10, 11 changed suffix "SYN" to "S".
- p.14; Fixed reference to Sect. from 8.1 to 8.
- p.20; Corrected date "Sep 29 2011" --> "Sep 29 2012".
- p.22; Fixed equation in footnote 22.
- p.23; Recomputed values for: 1) mutual angle j, 2) advance of apsidal line dOmega/dt, 3) advance of nodal line domega/dt, because we were using incorrect formula for the mutual angle.
- p.24; The referee's criticism was acknoledged.
- p.26; Table~12. Corrected footnote number~2: "Omega_2" --> "Omega_1".
- p.26; Table~12, Footnote: "solution of the V^2" --> "solution of V^2 and T_3\phi" .
- p.32; Resolution of the CHARA/VEGA was incorrect. It was corrected to 5000.
- p.36; Table~C.2, Decreased precision of the orbital phase of orbits~1 and 2.
- p.46; A typo B - > V.
- p.47; Caption of Tables~D.6 and D.7 - the description of projected baseline coordinates u and v were interchanged.