A level was set up at point A and distance to the staff station B was 100m. The net combined correction due to curvature and refraction as applied to the staff reading is

- 1
  
  0.00673 m
- 2
  
  0.000673 m
- 3
  
  -0.000673 m
- 4
  
  -0.00673 m

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