The wide mass range of our MS is ideal to study large polymers, even at the low charge states that are often offered by addition of amines or amine-based salts to the electrosprayed solution. This is illustrated in the first figure, where the solvent is 1-Methyl-2-pyrrolidone (NMP) containing dimethylammonium formate [reference 5 in Publications]. Recent work by graduate student Carlos Larriba with polydimethylsyloxane is illustrated in the second figure. The high mass range of the MS enables observing the weak bluish lines in the top right region (corresponding to spherical ions), where ion identification is straightforward. At lower m/z, ions are fully stretched, many charge states merge in a crowded region around the lower inclined line, and ion assignment is harder.