XGC-A04: Increased particle transport in the SOL region
The particle diffusivity in the outside separatrix region has been increased from 0.05 to 0.5 
tbl_D_coeff2=0.5D0 ! m^2/sec, D_turb for outside of separatrix (SOL+private flux region)
The resulting plasma density profile is identical to the profile obtained in the case XGC-A03.
This problem is likely related to a mistake in the particle diffusivity implementation in the SOL region.