Variation of the FWHM of the dust tail with local latitude. The dashed blue line with diamond markers corresponds to the ecliptic longitude of a rotation axis of 70^°, with the local latitude ranging from 40^° to 90^°. The solid red line with circular markers corresponds to an ecliptic longitude of 250^°, with the local latitude ranging from −40^° to −90^°. The vertical bars indicate the standard deviation of FWHM.