Response functions of the Stokes profiles at the flare and no-flare time. Top and middle rows: response functions of the Stokes profiles to temperature, velocity, and LOS magnetic field as a function of wavelength, obtained during the no-flare time (top panel) and the flare peak time (middle panel). Bottom panels: mean RFs around the line core for the pixels located on the dashed line at the flare time (right) and the no-flare time (left). The dotted black lines refer to the maximum RF values.