## Expression for the ExB flow shear rate is improved in the XGC-0 code

The ExB flow shear rate has been implemented as simple derivative of the radial electric field with respect to minor radius:

New implementation is according to Ref. [T.S. Hahm and K.H. Burrell Phys. Plasmas 2, 1648 (1995)]:

where and are the poloidal and toroidal components of the magnetic field.