Display of example data in gnomonic projection. The field center is at l = 160°, b = 30°, the field size 27°.7. Top left: eigenvalues λ_(p_υ) of VDA velocity caustics p_υ at υ_LSR = 0 km s⁻¹. Top right: deviations λ_(p_υ) − λ_(p) between eigenvalues from VDA velocity caustics p_υ and observed intensities p. Bottom left: velocities υ_LSR(p_υ) of filamentary FIR structures in case of H I filaments derived for VDA velocity caustics p_υ. Bottom right: deviations υ_LSR(p_υ) − υ_LSR(p) from the velocity field υ_LSR(p) shown in Fig. 6 of Paper I.