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Hi Sean, Thank you very much for your reply! I emailed Professor Zhongping Lee, and he mentioned that the "check 443 range" procedure is entirely based on their data and experience. It's intended to ensure that the aph440 product remains within a reasonable range even when there are issues...

Hello everyone, I noticed that in the pml_iop_calculate.c file （https://oceancolor.gsfc.nasa.gov/docs/ocssw/pml__iop__calculate_8c.html）, there is also a "check aph443 range" code segment （line 87-105）, and the comments mention that "this sanity check is an empirical fix from the Lee ...

Why was the ‘check aph443 range’ code (lines 412-440) added in the source code of the QAAv6 algorithm in l2gen (https://oceancolor.gsfc.nasa.gov/docs/ocssw/qaa_8c_source.html)?