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Table 2:

Related Spitzer-selected $z\sim 2$ ULIRGs samples.
Sample N $F_{\rm 24~\mu m}$ $\langle F_{\rm {24~\mu m}}\rangle$ IR color selection r density
    $\mu $Jy $\mu $Jy   Vega deg-2
This work 33 400 566 $F_{\rm {3.6~\mu m}}$ $F_{\rm {4.5~\mu m}}$ $F_{\rm {5.8~\mu m}}$ $F_{\rm {8.0~\mu m}}$ 23 65
Lonsdale et al. (2008) 61 400 819 $F_{\rm {3.6~\mu m}}$ $F_{\rm {4.5~\mu m}}$ $F_{\rm {5.8~\mu m}}$ $F_{\rm {8.0~\mu m}}$ 23 55
Farrah et al. (2008) 32 500 726 $F_{\rm {3.6~\mu m}}$ $F_{\rm {4.5~\mu m}}$ $F_{\rm {5.8~\mu m}}$ and $F_{\rm {4.5~\mu m}}$ $F_{\rm {8.0~\mu m}}$ 23 34
Huang et al. (2009)a 12 500 689 0  [3.6]-[4.5]  0.4    
        -0.7  [3.6]-[8.0]  0.5    
Magliocchetti et al. (2007) 793 350     25.5 200
Yan et al. (2005) 52 900   $\log_{10}(\nu f_{\nu}(\rm {24~\mu m})/\nu {\textit f}_{\nu}(\rm {8~\mu m}))$  0.5    
        $\log_{10}(\nu f_{\nu}(\rm {24~\mu m})/\nu {\textit f}_{\nu}(\rm {0.7~\mu m})$)  1.0    
a The sample of Huang et al. (2009) differs by only one source from the one of Younger et al. (2009).

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