Images of comet C/2011 KP36 (Spacewatch) in the r-sdss filter processed by a rotational gradient method. (a) Comparison of the observed (gray contours) and model jets: J1 is shown by red circles, J2 by blue circles, J3 and J4 by black circles. (b) Comparison of the observed and the modeled wave structure in the J4 jet (black). Directions to the Sun (⊙), north (N), east (E), and the negative velocity vector of the comet (V) are also provided. Negative distance is in the solar direction, and positive distance is in the antisolar direction.