Gabriel n°36 was used as a test bed aircraft for the "Belette" and "Furet" ELINT equipment suites from 1966 on. 
However, the exact configuration of n°36 when this picture was taken at Metz in 1977 - experimentation had just ended
by then - is uncertain. It was still equipped with UHF antennas related to the "Furet III" system
although the wingtip fairings had been removed (see <a href="http://www.16va.be/page_furetIII.html"><strong>
THIS</strong></a> picture). On the other hand, it had none of the standard antennas of a Gabriel. The former
locations of the various antennas used during tests were conspicuous under the belly. N°36 would have ended
its career as a cargo aircraft.