How to interprete the output of --export-ownertrust?

Christine Kremsmayr c.kremsmayr at
Sun Apr 3 11:22:47 CEST 2016

Hi everyone,

with the command gpg2 --export-ownertrust I can cause GnuPG to display 
the owner trust values of the public keys in my keyring.
The problem: I don't know how to interprete the numbers to the right of 
the fingerprints:

C:\Users\ckr>gpg2 --export-ownertrust
gpg: verwende Vertrauensmodell PGP
# Liste der zugewiesenen Trustwerte, erzeugt am 02/28/16 13:42:21
Mitteleuropõische Zeit
# ("gpg --import-ownertrust" um sie zu restaurieren)

What is the meaniong of 3? And of 6? Does anybody know what the possible 
values are that can be displayed?

Is there a mapping between these numbers and the owner trust values like 
"unknown", "marginal", "complete" and so on?
I know, the answer lies in the source code. But unfortunately I am not 
able to read or understand source code.

Best regards Christine

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