Enhanced gas images of the comet obtained on October 27 and 29, 2010. The Larson-Sekanina method has been applied to fully calibrated images after subtracting the underlying continuum as explained in Sect. 2. From left to right: CN on October 27 at 02:45 UT (mid-time during exposure), CN on October 29 at 05:15 UT (mid-time during exposure), C₃ on October 29 at 03:02 UT (mid-time during exposure). The FOV is 11   800 × 11   800 km. Aside from the reported CN jet by Samarasinha et al. (2011) and Meech et al. (2011), the C₃ coma distribution also displays similar jet structures in the north-south direction.