Top: Commander CMB temperature map derived from the Planck 2015, 9-year WMAP, and 408 MHz Haslam et al. observations, as described in Planck Collaboration X (2016). The gray boundary indicates the 2015 likelihood temperature mask, covering a total of 7% of the sky. The masked area has been filled with a constrained Gaussian realization. Middle: difference between the 2015 and 2013 Commander temperature maps. The masked region indicates the 2013 likelihood mask, removing 13% of the sky. Bottom: comparison of the 2013 (gray) and 2015 (black) temperature likelihood masks.