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Table 3
Systematic uncertainties for the aerosol optical depths that affect the observed Cherenkov light of the MAGIC telescopes.
| Type | Clouds (%) | Calima (%) | This sample (%) | Comments |
|---|---|---|---|---|
| Uncertainties on optical depth of layer – LIDAR only | ||||
| Absolute calibration of LIDAR | – | 2 | 1 | |
| Light emission inside layer/assumptions LR | 10 | ≪10 | ≲6 | |
| Color correction | <1 | <5 | ≲1 | |
| Larger LIDAR FoV than cloud substructures | 2 | – | 1.5 | |
| Rapid cloud movement during LIDAR exposure | 12 | – | 6 | |
| Quadratic sum for optical depth | 16 | <8 | ≲9 | |
Systematic errors on  – science data correction |
||||
| Rapid cloud movement/mismatch obs. vs. char. FoVs | 8 | – | 4 | |
| Air shower maximum reconstruction | ≲30 | – | ≲15 | Affect mainly low and |
| Assumptions mean width air shower long profile | ≲5 | – | ≲2.5 | Medium zenith angles |
Quadratic sum for  |
≲31 | – | ≲16 | ≲ 11% forhighzenithangles |
Resolution on  – energy resolution |
||||
| Air shower maximum reconstruction | ≲60 | – | ≲33 | |
| Assumptions mean width air shower long profile | ≲30 | – | ≲17 | |
Quadratic sum for resolution of  |
≲70 | – | ≲37 | |
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