Table 2. Comparison of the Instrument Calibration Results of SCref, NO2 Slant Column in the High-Sun Reference, From Three Different Methodsa


Calibration methods	MF-DOAS (DU)	Pandora (DU)

FTUVS absolute method	0.105	0.105
Langley method	0.12	0.12
Bootstrap method	0.12~0.15	0.12~0.15

aValues for Langley and bootstrap methods are taken from Herman et al. [2009].