What is the definition of "auto removable" and other sections ("manual"?) in Synaptic ?

Intuitively it should be list of packages that are not required by other packages but this does not seem to be the case. Same with "manual" and "local" - it looks like it is assigned randomly :(

Is there some official documentation that I have failed to found ?

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Packages that have been automatically installed as dependencies and not required anymore. – grawity Sep 25 '11 at 15:02
Is there a way to get similar list but with suggestions treated as requirements ? – Marcin Wisnicki Sep 25 '11 at 15:58
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