/usr/lib/libblas/din3 is in libblas-test 3.7.0-2.
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 10 11 12 13 14 15 16 17 18 19 | 'DBLAT3.SNAP'     NAME OF SNAPSHOT OUTPUT FILE
-1                UNIT NUMBER OF SNAPSHOT FILE (NOT USED IF .LT. 0)
F        LOGICAL FLAG, T TO REWIND SNAPSHOT FILE AFTER EACH RECORD.
F        LOGICAL FLAG, T TO STOP ON FAILURES.
T        LOGICAL FLAG, T TO TEST ERROR EXITS.
2        0 TO TEST COLUMN-MAJOR, 1 TO TEST ROW-MAJOR, 2 TO TEST BOTH
16.0     THRESHOLD VALUE OF TEST RATIO
6                 NUMBER OF VALUES OF N
1 2 3 5 7 9       VALUES OF N
3                 NUMBER OF VALUES OF ALPHA
0.0 1.0 0.7       VALUES OF ALPHA
3                 NUMBER OF VALUES OF BETA
0.0 1.0 1.3       VALUES OF BETA
cblas_dgemm  T PUT F FOR NO TEST. SAME COLUMNS.
cblas_dsymm  T PUT F FOR NO TEST. SAME COLUMNS.
cblas_dtrmm  T PUT F FOR NO TEST. SAME COLUMNS.
cblas_dtrsm  T PUT F FOR NO TEST. SAME COLUMNS.
cblas_dsyrk  T PUT F FOR NO TEST. SAME COLUMNS.
cblas_dsyr2k T PUT F FOR NO TEST. SAME COLUMNS.
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