The Mars Soiling Sensor has outputs for Transmission Loss and Soiling Ratio:
| Parameter | Range | Explanation |
| Transmission Loss (TL) | 0.000 to 1.000 | Transmission Loss, TL, is a dimensionless factor that represents the portion of incident light blocked by the dust on the sensor's window. For example, if TL = 0.1, it means that 10% of the incident light is blocked by dust. |
| Soiling Ratio (SR) | 1.000 to 0.000 | Soiling Ratio, SR, is a dimensionless factor that represents the ratio of the incident light received through the sensor window to that which is incident on the window. For example, if SR = 0.9, it means that 90% of the light goes through the window, and 10% is lost. |
Note that SR = 1 - TL.
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