Dust colour profiles, or normalized reflectivity S′ in units of % per 100 nm as a function of projected cometocentric distance, ρ, on October 27 and 29, 2010 obtained from the spectroscopic measurements. Negative ρ refers to the 70° direction on October 27 and to east direction on October 29. Positive ρ refers to the direction at PA = 250° on October 27 and to the westward direction on October 29. Black crosses: normalized reflectivity computed between the ranges 415.0–417.5 nm and 522.0–530.0 nm. Red asterisks: normalized reflectivity computed between the ranges 483.3–489.0 nm and 680.0–686.0 nm. Green open squares: normalized reflectivity computed between the ranges 440.0–437.0 nm and 677.5–692.5 nm, which are the same regions as the BC and RC filters.