Top: evolution of the 2010-06-13 prominence eruption. The circle marks the part of the prominence which was tracked and used to calculate the intensities. The field of view in the images is 300′′  ×  300′′. Bottom: variation of relative intensity as a function of velocity in the plane of the sky. Intensities are normalised by the intensity corresponding to the lowest velocity. The inset shows the relative intensity variation with axis scales specific to this event. The time evolution is coded in color (with the time-scale indicated on the right of the plot) in the online version of the figure.