What happened to (DECaLS DR1 to 4?)

https://www.legacysurvey.org//viewer/?ra=168.5923&dec=25.3289&layer=decals-dr2&zoom=16

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Noticed that there used to be older images from old data releases (eg. DR1, DR2…) Any idea why arent they in the viewer.

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DRs 1-4 didn’t really get used for anything, and later DRs have more images and better processing, so at some point we retired the old ones.

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Is there some way if they can come back?

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