What is the green "fog"

https://www.legacysurvey.org//viewer/?ra=50.7900&dec=-8.0575&layer=ls-dr9&zoom=13

It looks like it might be a reflection from one of the lenses inside the camera – you can see the donut shape of the primary mirror in this single exposure
https://www.legacysurvey.org/viewer/ccd/ls-dr9/decam-763422-N10.xhtml?rect=602,3737,100,100

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