hfx_type: full_ks_alpha

[Andrey]

Dear CP2K developers,

The hfx_type contains   following matrices
     REAL(dp), DIMENSION(:), POINTER          :: full_ks_alpha
     REAL(dp), DIMENSION(:), POINTER          :: full_ks_beta

These matrices are used for HFX (integrate_four_center) calculations
and stored in the qs_env%x_data%... variable.

However I did not find where they are initialized.

Could you please explain me what is their purpose?
If I want to calculate EXX kernel, what should I put into them?

Thanks in advance for your reply,
Best
Andrey