Symmetries of CMB Temperature Correlation at Large Angular Separations

New measurements are reported of the angular correlation function of the cosmic microwave background (CMB) temperature at large angular separation, based on published maps derived from WMAP and Planck satellite data with different models of astrophysical foregrounds. Results of different techniques are compared with each other, with and without masks in the regions of largest Galactic emissions. It is found that without the measurement bias introduced by masking, most maps yield consistent values near zero at 90 and 30 degrees and significant negative correlation at degrees greater than 160. It is argued that these properties are consistent with symmetries predicted in holographic quantum models of inflation, but unlikely to occur in the standard scenario.