Table 1. Uncertainty Budget, 2sigma Standard Deviation	
Source	Uncertainty
Noise (instrument and atmosphere)	
    Short routine	+/-(0.1 to 1.0) DU      (prop1/m) 
    Long routine 	+/-(0.1 to 0.5) DU      (prop1/m) 
Bootstrap selection    	<+/-0.2 DU                (prop1/m) 
Nonlinear wavelength dependence 	
    Instrumental    	<+/-0.1 DU                (prop1/m) 
    Atmospheric	+/-0.1 DU
Stratospheric background               	-0.10 +/- 0.05 DU
Other atmospheric gases 	
    +/-20 DU O3    	+/-0.03 DU
    +/-1 DU HCHO              	+/-0.05 DU
    +/-0.002 DU BrO                                                 	+/-0.04 DU
Temperature profile          	+/-0.03 DU
Surface pressure                                                                             	+/-0.01 DU
Total uncertainty   	
    Short routine                                     	-0.1 +/- (0.2 to 1.0) DU
    Long routine                                     	-0.1 +/- (0.2 to 0.6) DU