63) What is the correction for refraction for a distance of 5km (Correction of refraction =0.0112D²)

64) What is the correction for refraction for a distance of 800meters (Correction for refraction =0.0112D²)

65) What is the combined correction for curvature and refraction for a distance of 5km (Combined correction for refraction and curvature is 0.0673D²)?

66) What is the combined correction for curvature and refraction for a distance of 700m (Combined correction for refraction and curvature is 0.073D²)?