deletions | additions       diff --git a/section_Conclusion_We_undertake_a__.tex b/section_Conclusion_We_undertake_a__.tex  index 0542763..4ce14b6 100644  --- a/section_Conclusion_We_undertake_a__.tex  +++ b/section_Conclusion_We_undertake_a__.tex 
...
\section{Conclusion}  We undertake a search for Galactic bones in the region $|l|<60^\circ, |b|<1^\circ$. We use large-scale GLIMPSE \textit{Spitzer} images of the Galactic plane to search for skinny, largely continuous infrared dark clouds elongated along predicted spiral arms on a 2D plane of the sky map. We visually identify ten bone candidates that lie parallel to, and no more than twenty parsecs from, the physical Galactic midplane (assuming a flat Galaxy). We use radial velocity measurements derived from high and low density gas emission to establish velocity coherence and place the candidates in \textit{p-v} space. Of the ten candidates, six are also contiguous in velocity space, lie within 10 km/s of the global log-fit to CO or HI for the Scutum-Centaurus and Norma-4kpc arms, and possess an aspect ratio of at least 50:1. The other four candidates only fail the minimum aspect ratio criterion, and could be reclassified as we refine this criterion to account for projection effects.   Our strongest candidate, BC\_18.88-0.09 runs remarkably parallel to the physical Galactic midplane and lies just 10-15 pc above that plane. It also exhibits remarkable velocity coherence contiguity  and runs \textit{exactly} along the \citet{Dame_2011} fit to the Scutum-Centaurus arm in \textit{p-v} space. BC\_18.88-0.09 also possesses an aspect ratio of at least 140:1, suggesting that BC\_18.88-0.09 has formed as the result of a larger global spiral potential rather than the localized collapse of a giant molecular cloud. Cumulative evidence suggests that BC\_18.88-0.09 and our other classified galactic Galactic  bones mark the location of significant spiral features and can be used to pin down the accuracy of spiral arm models to within one pc in regions near bones. In future we plan to follow-up on our ten bone candidates---performing extinction mapping and obtaining high resolution spectra with a suite of dense gas tracers. Ultimately, we plan to build a skeletal model of the Milky Way, accumulating, classifying, and synthesizing hundreds of galactic bones en route to mapping the spiral structure of our Galaxy in unparalleled detail.