Emission line maps in the central region of NGC 6552 generated using the MRS channel 1 (3.2  ×  3.7 arcsec). Upper panel: line map of [MgV]5.61 μm as a representation of a coronal line emission, and illustrate the aperture used to extract the nuclear spectrum of NGC 6552 in channel 1. Middle panel: line map of [ArII]6.99 μm as a representation of a low-excitation line emission, and illustrate the aperture used to extract the circumnuclear spectrum of NGC 6552. Bottom panel: line map of H₂(0-0)S(5) as a representation of the molecular hydrogen line emission and an illustration of the aperture used to extract the central spectrum of NGC 6552.