From left to right, top to bottom, numbers and letters within brackets indicate the column and line labels, respectively. Examples of (1) continuum intensity, (2) magnetic field strength, (3) inclination, (4) B_l longitudinal (background image), and B_t transverse (overplotted vector field) components of the magnetic field in the LSF derived from the SIR inversion of the IBIS Fe I 617.3 nm line data, at optical depth logτ₅₀₀ = 1, at seven stages of the pore formation, at a) 13:58 UT, b) 14:26 UT, c) 15:08 UT, d) 16:08 UT, e) 18:44 UT, f) 19:29 UT, and g) 20:35 UT. North is at the top, and west is to the right. The arrow at the bottom left on panel 4a) represents a horizontal field of 1 kG; transverse field components lower than 0.2 kG are not shown. The contour line in each panel shows the location of the evolving structure singled out in the continuum data, as specified in Fig. 3.