SEBS4ILWIS - SMAC algorithm

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SEBS4ILWIS - SMAC algorithm

Pari
Hi everyone

I hope my question is related to this forum. Please let me know if it is not.

I am using SEBS4ILWIS and I am in the Atmospheric correction part.

In the SMAC process, there is a part where you have to enter a value for a coefficient file for sensor.
 
I have downloaded these coefficient files for MODIS, but there are 20 of them! They are like : coef_MODIS1_CONT.dat , or      
coef_MODIS1_DES.dat

I also know that Coefficients filenames with "CONT"  were computed for continetal aerosol model, and "DES" is for desertic aerosols. But the numbers change from 1 to 20.
What do these numbers mean?? Which one should I use?