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3.3.4 PCD summary in the Level2 products

Flag values are provided as Product Confidence Data (PCD). These PCD provide indications on the configuration and the performance of the processing at several stages of the retrieval. The meaning of the possible PCD values for the different datasets of the products is detailed in Appendix A.

In the case of the tangent line density MDS and of the local density MDS in the Level2 products, these flags give information about the validity of the outputs of the spectral inversion, the vertical inversion and the aerosol processing. For these data sets, only the non-flagged values (for which PCD is equal to 0) should be used.

Tangent line density

The PCD summary provides the PCD of tangent line densities for the following species in this order: O3, NO2, NO3, air, O2, H2O, OClO.

Local density

The PCD summary provides the PCD of local densities for the following species in this order: O3, NO2, NO3, air, O2, H2O, OClO.

Aerosol products

The PCD summary provides the spectral and vertical PCD (first and seventh values) of the extinction coefficient at the reference wavelength (500 nm), the other values are set to 0.