Mirage III E or R avionic compartment. Model E and its R variant for reconnaissance, were lengthened behind the cockpit to add an avionics compartment with a new aluminum folding rack for equipment, with significant electronic improvements.
With UHF/VHF radios, electronic equipment, navigational computer, oxygen tanks and fuel tank for inverted flight.
This model has been tested in adjustment and dimensions in the model kit of the Mirage III E/R of Italeri at 1/32 scale.