Atmospheric stratification of four physical parameters for two selected pixels (a) and (b) representing the penumbra (red line) and umbra (black line), respectively. Starting from the top left panel and moving clockwise: sine of the inclination, LOS velocity, magnetic field strength, and temperature. The position of the pixels is shown in Fig. 11 with a cross and diamond symbol. The retrieved information from the inversions is most reliable inside the dashed vertical lines, that is, between −2≤ log τ ≤0.