Comparison of observed and computed I/I_c and  − Q/I profiles at μ = 0.1 (upper panel), and at μ = 0.2 (lower panel). Left to right: (P1 + P2) C₂ lines (at 515.946 nm), (P3) C₂ line (at 515.960 nm), and MgH line (at 515.975 nm). The intensity profiles have been multiplied by a scaling number to fit in the same figures as the polarization rates. Plus symbols: observed intensity; full lines: computed intensity profiles. Cross symbols: observed Q/I spectrum. Dotted lines: polarization profiles computed with a depth-independent magnetic strength B = 12 G. Dashed lines: depth-independent magnetic strength B = 28 G. Dot-dashed lines: depth-independent magnetic strength B = 23 G