Temporal variations of the atmospheric parameters in the umbra (left column), and penumbra (right column) after removing the local background. The curves plotted in these panels correspond to r = 13″.8 and r = 7″.4 for the umbral and penumbral sets, respectively. From top to bottom,(panels a1–a3): δT, δυ_LOS and, δ|B_z| from the inversions of the Ca II 8542 Å line including a linear gradients in the magnetic field as a function of log τ. Panel a4: δ|B_z| from the inversions of the Ca II 8542 Å line (orange curve) and the Fe I line pair at 6302 Å (gray curve) separately with the assumption that the magnetic field is depth independent. Panels b1–b4 are similar to panels a1–a4, but the former depict δB instead of δ|B_z|. The red, blue, and green curves correspond to log τ = −5, −3, and, −1.