Modifications of the TEM liquid cell and their effect on the EDX spectrum.  In (a) a standard sample cell (subfigure (c), left) was used to obtain the EDX spectrum and the only signal observed is from the pole piece of the TEM and a small peak from the windows when tilted.  In (b) the modified holder (shown in (c), right) was used, and the expected peaks from the sample are clearly evident.  Figure reprinted from Zaluzec et al. (2014).