Fig. 4. Intensity contours as a function of phase and velocity for H₂ 1-0 S(1) in the Cyg spectrum. Contours are in steps of 5% in intensity. For orientation the areas representing 50% or less intensity are dotted, while the areas with 90% or more intensity are shaded. Note that the S(1) line is only weakly present in absorption at phase 1.0-1.1 with weak emission at -10 km s^-1 from the absorption.