tokens: We thank the anonymous referee for a careful reading of the manuscript and helpful suggestions that strengthened this paper greatly. We thank our colleagues on the AGES, ISS, SDWFS, NDWFS, and the XBoötes teams and the HerMES team for making the data publicly available. The first Spitzer MIPS survey of the Boötes region was obtained using GTO time provided by the Spitzer Infrared Spectrograph Team (PI, James Houck) and by M. Rieke. We thank the collaborators in that work for access to the 24 μ m catalog generated from those data by Emeric Le Floc’h. This work was supported under Contract NAS8-03060. R.J.A. was supported by Gemini-CONICYT Grant 32120009. K.N.H and R.C.H. were partially supported by NASA through ADAP Award NNX12AE38G and by the National Science Foundation through Grant 1211096. This work was also supported by Science and Technologies Facilities Council (STFC) grant ST/I001573/1 (D.M.A. and A.D.M.) and the Leverhulme Trust (D.M.A.). R.C.H. acknowledges support from an Alfred P. Sloan Research Fellowship and Dartmouth Class of 1962 Faculty Fellowship. C.-T.J.C was supported by a Dartmouth Fellowship and the William H. Neukom 1964 Institute for Computational Science.
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