call EXCH_Z_3D_RX (replaces EXCH_Z_XY_RX) with 1 for 3rd dimension (input argument)
call EXCH_Z_3D_RX (replaces EXCH_Z_XY_RX) with 1 for 3rd dimension (input argument)

altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h