$ apt-show-versions -a libpoppler13 libpoppler13 0.16.7-2+b1 install ok installed No stable version libpoppler13 0.16.7-2+b1 testing ftp.au.debian.org libpoppler13 0.16.7-2+b1 unstable ftp.au.debian.org
$ apt-show-versions -a libpoppler13
libpoppler13 0.16.7-2+b1 install ok installed
No stable version
libpoppler13 0.16.7-2+b1 testing ftp.au.debian.org
libpoppler13 0.16.7-2+b1 unstable ftp.au.debian.org