Long-term evolution of GJ 3470 quiescent FUV emission in the O I triplet (black), C II doublet (blue), Si III line (cyan), C III multiplet (green), Si IV doublet (yellow), N V doublet (orange), and O V line (red). Only the Si III and N V lines could be measured with STIS in the first three epochs. In each visit, line values have been slightly offset in time by increasing formation temperature for the sake of clarity.