# official debian repository (mirror selected via geo-ip):
  deb     http://http.debian.net/debian/ testing main contrib non-free
  deb-src http://http.debian.net/debian/ testing main contrib non-free

# security updates:
  deb     http://security.debian.org/ testing/updates main contrib
  deb-src http://security.debian.org/ testing/updates main contrib

# official debian repository:
#  deb     http://ftp.debian.org/debian/ testing main contrib non-free
#  deb-src http://ftp.debian.org/debian/ testing main contrib non-free

# official debian DE repository:
#  deb     http://ftp.de.debian.org/debian/ testing main contrib non-free
#  deb-src http://ftp.de.debian.org/debian/ testing main contrib non-free

# official debian AT repository:
#  deb     http://ftp.at.debian.org/debian/ testing main contrib non-free
#  deb-src http://ftp.at.debian.org/debian/ testing main contrib non-free