Top: projected and co-added images of Neptune’s equatorial plane, 2007 August 30 (60 min total exposure time) on the left, August 31 (109.5 min exposure time) on the right, revealing material at the Fraternité and Egalité locations, the satellites Proteus (P), Larissa (L), Galatea (G), Despina (D), and the Le Verrier ring. Image dimension: 16.4 arcsec². Bottom: corresponding brightness longitudinal profiles obtained from the images on top (converted into equivalent width). The angular resolution corresponds to 2 deg. The X-axis origin is the longitude L_Fr of the centre of arc Fraternité, from J2000 ascending node (respectively L_Fr = 341.62 and 349.01 deg).