Comparison of WISE and Spitzer data for the sources in common with Gautier et al. (2007). The red line shows a weighted least-squres fit for the offset between the Spitzer and WISE magnitudes, which is 0.083 mag with the WISE magnitudes being fainter. This offset stems from the different wavelength passbands (centered at 22 μm vs. 24 μm). The WISE data match the Spitzer data very well with only a few outliers at the faint end.