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High-pressure gas modules with cylindrical ionization chambers for a Very Forward Calorimeter (VFC) were constructed and tested in the U-70 electron beam of IHEP (Protvino). The read-out amplifiers were used in a remote mode (3 m long cables were used to connect the detector to the amplifier). The module performance was tested in the shower energy range 10-30 GeV employing different gas mixtures...