G/R ratio for each subslit and offseted spectrum for comet C/2002 T7 (LINEAR). The range of the nucleocentric distances covered by each point and the error on the G/R ratio are represented. The seeing is included in the x-errors and is indicated in km. It corresponds to the smallest size that can be resolved and explains the plateau found for the smallest spatial bin close to the nucleus. The G/R ratios as a function of the projected nucleocentric distance are plotted with solid curves. An H₂O production rate of 5.2 × 10²⁹ s^-1 and a 5% CO relative abundance were used with different seeing values and different CO₂ relative abundances. The fits give the CO₂ relative abundance of the comet. Only data points that were not offset were considered to computate the G/R profile provided by the model. The black dash-dotted curve represents the calculated G/R ratio not accounting for collisional quenching with 0% CO₂ relative abundance. The pentagon symbols are the data points for the offset observations.