Comparison of the magnetic field retrieved from the inversions with a single node in each component of the magnetic field vs. that from the inversions that includes a linear gradient in the magnetic field. B_(z,t)(log = −5, −1) is taken from the inversions of the Ca II 8542 Å line including magnetic field gradient. The depth-independent magnetic field values derived from the inversions of the Ca II 8542 Å line and the Fe I 6301.5 and 6302.5 Å lines are indicated as B_(z,t)(Ca II) and B_(z,t)(Fe I), respectively. Panel a: normalized two-dimensional histogram of B_z(log τ = −5) vs. B_z(Ca II). Panel b: similar to panel a, but comparing B_t(log τ = −5) and B_t(Ca II). Panel c: normalized two-dimensional histogram of B_z(log τ = −1) vs. B_z(Fe I). Panel d: similar to panel c, but comparing B_t(log τ = −1) and B_t(Fe I). The red line in all the panels illustrates a one to one correspondence.