Table 2.2 The distribution of guiding modes (hours)
===================================================
   SI      IN      EC      GY      CT      FL Total
  WFP  12.633   0.216   6.071   0.000 115.242 134.162
  FOC   0.333   0.000   0.411   0.000   3.810   4.554
  FOS   2.520   0.000   6.525   0.000  37.614  46.660
  HRS  30.253   0.249   3.066   0.000  34.981  68.551
  FGS   0.000   0.000   0.000   0.000   0.109   0.109
Total  45.740   0.465  16.073   0.000 191.757 254.035
    %  18.005   0.183   6.327   0.000  75.484 100.000
-----------------------
SI = Science Instrument
IN = Internal
EC = Earth Calibration
GY = Gyro
CT = Coarse Track
FL = Fine Lock
%  = Percentage

Note:

Since the engineering telemetry is missing frequently because of the
failure of tape recorder 2, correct determination of the status of GS
Acquisitions is sometimes impossible.  Therefore, the above statistics
might be inaccurate.