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/usr/share/scalapack/BLLT.dat is in scalapack-test-common 1.8.0-9build1.

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 1.2, banded linear systems input file'
'MPI machine'
''                              output file name (if any)
6                               device out
'U'                             define Lower or Upper
 8                              number of problem sizes
 3 5 17 28 37 121 200 1023      values of N
 6                              number of bandwidths
 1 2 4 10 31 64                 values of BW
1                               number of NB's
-1                              values of NB (-1 for automatic determination)
1                               number of NRHS's (must be 1)
4                               values of NRHS
1                               number of NBRHS's (ignored)
1                               values of NBRHS (ignored)
 4                              number of process grids
 1 2 3 4                        values of "Number of Process Columns"
3.0                             threshold