This file is indexed.

/usr/lib/blacs/bsbr.dat is in blacs-test-common 1.1-31ubuntu1.

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

The actual contents of the file can be viewed below.

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3                       Number of scopes
'R' 'C' 'A'             values for scopes
8                       Number of topologies
'I' 'S' '1' 'd' 'm' ' ' 'T' 'H'   TOP
5                       Number of shapes
'G' 'U' 'U' 'L' 'L'     UPLO
'E' 'U' 'N' 'U' 'N'     DIAG
5                       Number of matrices
2 1 25 13 0             M
2 7 19 32 0             N
3 3 25 14 1             LDASRC
2 2 25 22 1             LDADEST
4                       Number of src/dest pairs
0 1 3 2                 RSRC
0 0 1 1                 CSRC
4                       Number of grids
2 4 1 1 7 1 4           NPROW
2 1 3 4 1 8 2           NPCOL