Syndyne-synchrone grids overplotted on the observation images of comet E3. The yellow lines denote the synchrones of 30, 60, 90, 120, and 150 days (from top to bottom) before the respective observation dates, and the red lines denote the sydynes of β = 1, 1 × 10⁻¹,1 × 10⁻², and 1 × 10⁻³ (from top to bottom). The images are oriented with north up (increasing DEC in degrees) and east to the left (increasing RA in degrees).