Figure 2.

Ion images for Hb α^H 7+ monomer (a–c), αβ^2H 11+ dimer (d–f), and (αβ^2H)₂¹⁵⁺ tetramer (g–i) produced without arrival time (t_A) filtering (a,d,g), with a broad selection rule that predominantly removed singly charged signals (b,e,h), and with a specific t_A selected for each ion of interest (c,f,i). Color bars indicate normalized signal intensity after baseline subtraction.