deletions | additions       diff --git a/Observations spectra.tex b/Observations spectra.tex  index 58740b2..ecb1866 100644  --- a/Observations spectra.tex  +++ b/Observations spectra.tex 
...
\subsection{Ground-based spectroscopy}\label{spectra}  We took a total of 25 high-resolution echelle spectra from three ground-based spectrographs. At many orbital phases, prominent absorption lines show a clear double-lined signature when inspected by eye. We find that KIC 9246715 is an excellent target for obtaining radial velocity curves for both stars in the binary as the stellar flux ratio is close to unity. A long time span of observations was necessary due to the 171.277-day orbital period of the binary and visibility of the \emph{Kepler} field from the observing sites.  \subsubsection{TRES echelle at from  FLWO}\label{tres} We obtained 13 high-resolution optical spectra from the Fred Lawrence Whipple Observatory (FLWO) 1.5-m telescope in Arizona using the Tillinghast Reflector Echelle Spectrograph (TRES) from 2012 March through 2013 April. The wavelength range for TRES is 3900--9100 \AA, and the average resolution is 30,000. We reduced the data using the freely available standard pipeline\footnote{http://tdc-www.harvard.edu/instruments/tres/reduce.html}.  \subsubsection{ARCES echelle at from  APO}\label{arces} We also obtained ten high-resolution optical spectra from the Apache Point Observatory (APO) 3.5-m telescope in New Mexico using the Astrophysical Research Consortium Echelle Spectrograph (ARCES) from 2012 June through 2013 September. The wavelength range for ARCES is 3200--10,000 \AA \ with no gaps, and the average resolution is 31,000. We reduced the data using a standard echelle reduction techniques and Karen Kinemuchi's ARCES cookbook (private communication)\footnote{http://astronomy.nmsu.edu:8000/apo-wiki/wiki/ARCES#reduction - ARC Echelle Spectragraph (ARCES) Data Reduction Cookbook}. We found a minor discrepancy ($\sim 0.3$ \AA \ at $7640$ \AA) between different nights' wavelength solutions for some of the earlier spectra, and used telluric features in this wavelength regime to apply small shifts in velocity space when necessary. We subsequently took thorium-argon calibration spectra more frequently which has corrected the problem.  \subsubsection{APOGEE spectra}\label{apogee} spectra from APO}\label{apogee}  We finally obtained two near-IR spectra of KIC 9246715 from the Sloan Digital Sky Survey-III (SDSS-III) Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey \citep{2015arXiv150100963A}. The wavelength range for APOGEE is 1.5--1.7 microns with a nominal resolution of 22,500. The pair of spectra were reduced with the standard APOGEE pipeline, but not combined.  \subsubsection{Global wavelength solution}\label{wavelength}