Ohmic Elsasser number for the DIANA typical disk (first row). White contours correspond to the location of the total charge in the disk. Ambipolar diffusion Elsasser number is shown in the second row. The location where the C and C⁺ abundances are equal are overplotted in red. The stability criterion Eq. (74) for all modes to be damped, corresponding to a dead zone, is shown in the lower panels (Jin = 1). Left column:models with β_mid = 10⁴. Right column: models with β_mid = 10⁶.