Median stack images of P/2016 G1 obtained with the OSIRIS instrument of the 10.4 m GTC through a Sloan r′ filter, at the indicated dates. North is up, east to the left. The directions opposite of the Sun and the negative of the orbital velocity motion are shown. The arrow in the middle of central panel indicates the westward feature that emerges from the inverted-C shape mentioned in the text. The dimensions of the panels (from left to right, in km, projected on the sky at the asteroid distance) are 27,930 × 27,930, 26,305 × 26,305, and 27,025 × 27,025. The images are stretched linearly in brightness, with maximum intensity levels, from left to right, of 8 × 10⁻¹⁴, 5 × 10⁻¹⁴, and 4 × 10⁻¹⁴ solar disk intensity units. Faint trailed stars are apparent near the head of the object, perpendicular to the tail, in the 2016 June 8.91 image, the brightest one being indicated by an arrow.