Table 5. Estimated uncertainties in the relative calibration methods of Brest and Rossow (1991)

                                                                Uncertainty
                      Category                                      (%)
------------------------------------------------------          -----------
Model approximations for radiative transfer to                     <1.0
increase computational speed

Uncertainties in atmospheric properties, specifically              <2.0
uncertainties due to ozone absorption

Neglected effects of atmosphere and surface properties             <4.7
on the measured radiance.

TOTAL RMS                                                          <5.0