gray regions of the SOM in the middle panel of Figure \[figure:colors\]), a starting priority of 3 to objects in cells with a spectroscopic redshift(s) of only moderate confidence, and a starting priority of 1 to galaxies in color cells that already have one or more high-confidence spectroscopic redshifts. Galaxies with existing redshifts of at least moderate confidence were not targeted.]{}

2.  [We multiply each galaxy’s priority by the number of objects in its color cell, effectively upweighting sources with common SEDs.[^2]]{}

3.  [We penalize objects that are color outliers within their color cell in order to avoid using them for calibration. A small fraction of objects in the sample are not represented well in the SOM, either because they have abnormal colors from photometric errors or the superposition of two or more sources, or are truly rare objects (e.g., X-ray sources). We want to avoid calibrating with these.]{}

As will be described in future data releases, this prioritization scheme has been refined for the 2016B and later observations to more efficiently map the color-redshift relation. In M15 we pointed out that spectroscopic effort could also be intentionally directed at regions of color space with intrinsically higher redshift uncertainty (e.g., 