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We present an internal consistency test of South Pole Telescope (SPT)measurements of the cosmic microwave background (CMB) temperature anisotropyusing three-band data from the SPT-SZ survey. These measurements are made fromobservations of ~2500 deg^2 of sky in three frequency bands centered at 95,150, and 220 GHz. We combine the information from these three bands into sixsemi-independent estimates of the CMB power spectrum (three single-frequencypower spectra and three cross-frequency spectra) over the multipole range 650 <l < 3000. We subtract an estimate of foreground power from each power spectrumand evaluate the consistency among the resulting CMB-only spectra. We determinethat the six foreground-cleaned power spectra are consistent with the nullhypothesis, in which the six cleaned spectra contain only CMB power and noise.A fit of the data to this model results in a chi-squared value of 236.3 for 235degrees of freedom, and the probability to exceed this chi-squared value is46%.

Consistency of cosmic microwave background temperature measurements in three frequency bands in the 2500-square-degree SPT-SZ survey