How to remove broken compression nut from the fitting?


During the tightening of the compression nut while changing the frit in the pressure sensor, the nut broke. The lower part of the nut is stuck in the fitting together with the ferrule. We are wondering how can we remove the broken nut. 

The instrument in question is Agilent 1290 Infinity II quaternary pump G7140A.

Attached is the picture of the broken nut in the pressure sensor to visualize our problem.

Any help is appreciated :)

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