Permissions on file created by COPY TO

Of I run a COPY TO command it creates a file. What determines the
permissions of that file? The created file is owned by postgres, but I
need a different user to be able to manipulate it (actually, I just want
to delete it). So I thought to make it group writable so the other user
could be in postgres group and delete the file.

Thank you,
--
Joel Shellman
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