Demonstration of the high energy resolution offered by the latest generation of monochromatized STEM (NION Chromatem) : (left) zero loss peak (ZLP) recorded in vacuum exhibiting a symmetric profile of FWHM below 5 meV; (right) same peak displayed on a logarithmic scale, demonstrating a large reduction of intensity in its tail of the order of 10⁻³ over an energy window of 40 meV, thus giving access to the recording of very low-energy excitations.