Some questions about "H-APha Dual Pol Decomposition" algorithm in SNAP

Microwave Toolbox Polarimetry
#1

Hello, I want to make sure that the following is the algorithm of “H-Alpha Dual pol Decomposition”, is it the first picture or modify the second picture?

3d31b192ddc46c6fc8c7f16dc50fd60
3d31b192ddc46c6fc8c7f16dc50fd601582×564 35.3 KB

bc2ff568b24c3cdb5a415948de8e06d
bc2ff568b24c3cdb5a415948de8e06d1623×696 51.5 KB

#2

I want to know whether C2 in PolSARpro is a covariance matrix or a coherence matrix.