/usr/share/VTKData/Data/headsq/quarter.nhdr is in vtkdata 5.8.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | NRRD0004
dimension: 3
sizes: 64 64 93
spacings: 3.2 3.2 1.5
endian: little
type: short
encoding: raw
space: 3D-left-handed
data file: quarter.%d 1 93 1
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