Peak intensity map of the He i 1083.0 nm triplet emission profile. The prominence is seen as a bright structure against a dark background. The lower dark part corresponds to the solar limb. The top-left arrow points to solar North. The deprojected height (see Sect. 2) above the solar surface is shown on the right axis. The data was taken 20 May 2011 at 9:44 UT and finished at 11:15 UT on the same day.