https://www.legacysurvey.org//viewer/?ra=199.1377&dec=14.4470&layer=ls-dr10-early-grz&zoom=14
Heh 
The camera we use (DECam) has gaps between its 60+ CCD chips, so if we only take a single exposure, we leave gaps. If we take two exposures, we cover most of the gaps, but not all!