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We observed the nearby starburst galaxy NGC 253 in the mid-infrared to obtain a three-dimensional data set with arcsecond angular resolution and 0.2 km spectral resolution. The observations show the major spectral features in the upper half of the mid-IR window : the 11.3 km polycyclic aromatic hydrocarbon (PAH) line and the 12.8 km [Ne II] line as well as the broad silicate absorption feature at 9.7 km. We use the [Ne II] line to determine the emission measure of the ionized gas, and indoi:10.1086/307246 fatcat:sc5x7mbxhnconf6quhxjig7jui