This file is indexed.

/usr/share/scalapack/INV.dat is in scalapack-test-common 1.8.0-12.3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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'ScaLAPACK, Version 1.0, Matrix Inversion Testing input file'
'MPI machine.'
'INV.out'			output file name (if any)
6				device out
5				number of matrix types (next line)
'GEN' 'UTR' 'LTR' 'UPD' 'LPD'	GEN, UTR, LTR, UPD, LPD
4				number of problems sizes
2 5 10 15 13 20 30 50		values of N
4				number of NB's
2 3 4 5 6 20			values of NB
4				number of process grids (ordered P & Q)
1 2 1 4 2 3 8			values of P
1 1 4 1 3 2 1			values of Q
1.0				threshold