Normalized response functions of Stokes I to temperature (top panels) and Stokes V to the magnetic field strength (middle and bottom panels) for the atmosphere at location A. Top panels: response functions of Stokes I to temperature of the Si i 10 827 Å line (left panel) and Ca i 10 839 Å line (right panel). The region between the vertical while solid lines has been neglected for the inversions. Middle panels: response functions of Stokes V to magnetic field of the Si i 10 827 Å line (left panel) and Ca i 10 839 Å line (right panel). Bottom panels: variation of the response functions of Stokes V to the magnetic field of the Si i 10 827 Å line (dashed line) and the Ca i 10 839 Å line (dotted line) with log τ at the wavelengths indicated by the dashed and dotted lines in the middle panels, respectively.