Alignment between the magnetic field vector and the curve of the maximum formation height at optical depth unity in two selected vertical slices. Left column: blue curve fibril in Fig. 8. Right column: red curve fibril in Fig. 8. Top row: formation heights of Hα (red) and Ca II 8542 Å (blue) with the β = 1 height (white dotted) layered over the mass density (grayscale background). Middle row: angle between the inclination of the magnetic field and the τ = 1 curve. Bottom row: angle between the magnetic field azimuth and the azimuth of the fibril.