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Overall configuration of the EM-30 equipment with accelerometers: (a) EM-30 consists of a main body, a computer for data acquisition and signal processing, and a table supporting the equipment; accelerometers were installed on (b) the pump with directions along the y- and z-axes, (c) electron gun with directions along the x- and z-axes, (d) floor (ground) with directions along the y- and z-axes, and (e) table with directions along the y- and z-axes.
