I have a question about the stability diagnostics (e.g., CFL conditions) for a non-hydrostatic simulation. After turning on the DIAG_CFL flag, the screen display shows a few CFL conditions that are specific to the non-hydrostatic mode, which are: NBQ_HADV, NBQ_IMP, and NBQ_VSOUND. According to the tutorial, NBQ_HADV is the CFL condition associated with the horizontal pseudo-phase-speed of acoustic waves. I presume the other two CFL conditions are associated with the vertical pseudo-phase-speed of acoustic waves. Can someone explain what those two CFL conditions are and the difference between them? Also, what are the typical upper bounds of those CFL conditions?