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Caption: Figure 1.
Footprints of the optical imaging surveys contributing to DESI imaging, demarcated by the thick red outlines, are shown here in an equal-area Aitoff projection in equatorial coordinates. The region covered by the BASS and MzLS surveys is almost entirely in the North Galactic Cap (NGC) at declinations δ ≥ +32°, and DECaLS covers the entire South Galactic Cap and the δ ≤ +34 regions in the NGC. The regions covered by existing wide-area spectroscopic redshift surveys (SDSS, 2dF, and BOSS; Colless et al. 2001; Abazajian et al. 2009; Abolfathi et al. 2018) are shown in the blue gray scale in the map provided, where the darker colors represent a higher density of spectroscopic redshifts. The Legacy Surveys provide deeper imaging and can leverage the existing spectroscopy in these regions, unlike most other existing or ongoing deep imaging surveys (e.g., DES, ATLAS, KIDS, etc.; The Dark Energy Survey Collaboration 2005; de Jong et al. 2015; Shanks et al. 2015).
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