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what is collimation constant?

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Postion of Level                 Near Sights                                 Distant Sights
Mean of Thread                Interval Bet                                   Mean of Thread      Interval Bet
Readings feet                    Top & Bottom Thread yards     Readings feet        Top & Bottom Thread yards
-----------------------------------------------------------------------------------------------------------
Near A            3.134                     0.029                                    2.540                     0.265
Near B            3.907                     0.030                                    4.486                      0.264
-----------------------------------------------------------------------------------------------------------

If the correction for curvature and refraction for each of the long sights is 0.002ft, what is collimation constant?
Remember that 0.002 is subtracted.
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