MUSE line spread functions (LSF) measured in the non sky-subtracted HDFS and udf-10 MUSE data cubes. The LSF spatial mean FWHM (i.e.  averaged over the data cube FoV) are indicated by the solid lines, and their 1σ spatial variation by the respective shaded areas. The latter corresponds to a typical error in the derived velocity dispersion of σ ≲ 1 km s^-1. The black squares (udf-10) and triangles (HDFS) indicate the positions of the sky line measurements.