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. Author manuscript; available in PMC: 2018 Apr 9.
Published in final edited form as: Int J Min Sci Technol. 2018 Jan;28(1):43–51. doi: 10.1016/j.ijmst.2017.12.013

Fig. 8.

Fig. 8

Vertical roof deformation measured by extensometers when the longwall face was 1.8 m inby the center of the mid-pillar site.