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Attached the spectrograms of the residual displacement of LVDTs from 2019/5/18 9:00am to 2019/5/19 9:00am, when the damping loops are continuously closed.

LVDTL190518.jpg

LVDTT190518.jpg

LVDTV190518.jpg

LVDTR190518.jpg

LVDTP190518.jpg

LVDTY190518.jpg