30 GHz T, Q, and U map differences between two pipeline executions using different levels of compression (n_ψ = 32 768 and n_ψ = 4096), smoothed by a 1° beam. The differences in temperature look like correlated noise, and in polarization we have some leakage from polarized synchrotron. In both cases, the amplitude of the differences is much lower than the uncertainties from other effects.