Variation of the magnetic field strength (B strength), transverse (B tran), and longitudinal (B long) components in the LSF (top panel), field inclination, and azimuth in the LSF (middle panel), and LOS plasma velocity v_LOS (bottom panel) derived from the IBIS photospheric Fe I 617.3 nm line data during the pore formation, inside (black lines) and outside the evolving feature (blue lines). Each plot shows the mean and standard deviation of the values derived from the data inversion and other methods described in Sect. 2. Field, angle, and velocity values are given in kG, degree, and km s^-1 units, respectively. For the sake of clarity, the standard deviation is shown only for magnetic field strength, inclination, and v_LOS estimates, inside and around the evolving structure. The vertical dotted lines show the time interval lacking IBIS observations. The numbers in the upper panel indicate the seven times corresponding to the evolutionary stages shown in Figs. 5 and 6.