Table 4
Comparison of estimated vs. observed systematic uncertainties after the LIDAR correction Method II.
| T9 km Bin | Prediction uncertainty  |
Observed bias for f | Observed excess fluct. for f | Reduced atm. excess fluct. for f | Prediction uncertainty for a | Observed bias for a | Observed excess fluct. for a | Reduced atm. excess fluct. for a |
|---|---|---|---|---|---|---|---|---|
| 0.9 < T9 km < 1.0 | 1% | (0 ± 2)% | (6 ± 3)% | (4 ± 5)% | 0.004 | −0.03 ± 0.02 | 0.04 ± 0.03 | 0.00 ± 0.04 |
| 0.82 < T9 km < 0.9 | 3% | (−2 ± 2)% | (8 ± 1)% | (7 ± 2)% | 0.01 | −0.01 ± 0.02 | 0.10 ± 0.05 | 0.09 ± 0.06 |
| 0.65 < T9 km < 0.82 | 7% | (−5 ± 4)% | (18 ± 4)% | (18 ± 5)% | 0.03 | 0.03 ± 0.05 | 0.09 ± 0.06 | 0.08 ± 0.08 |
| 0.5 < T9 km < 0.65 | 15% | (−11 ± 4)% | (16 ± 8)% | (16 ± 9)% | 0.05 | 0.02 ± 0.03 | 0.06 ± 0.11 | 0.05 ± 0.15 |
Notes. Predictions have been calculated from the total displayed in Table 3. Observed quantities refer to the average of the observations from three zenith-angle bins (e.g., displayed in Fig. 10). Reduced quantities have been obtained from “observed,” after quadratic subtraction of the excess uncertainty observed with the clear-nights reference spectrum: 4% for flux and 0.04 for spectral index a.
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