Note: you must use the instrument readings to calculate Reduced Levels, as you have done for the levelling run, (Task 1.3). 1. Sum BS column and sum FS column. Calculate misclose. 2. Calculate Rises and Falls. 3. Sum Rise column and sum Fall column. Check that the difference is the same as Sum of BS minus Sum of FS, (misclose). 4. Calculate RLs. Ensure that the difference between first RL and last RL agrees with Sum of BS minus Sum of FS, (misclose).