discrepancy in segy header #2

$ segyread tape=elastmarm-TrueVs.sgy > elastmarm-TrueVs.su
3200+0 records in
0+1 records out
171 bytes (171 B) copied, 0.000806136 s, 212 kB/s

segyread: discrepant tr.ns = 0 with tape/user ns = 60
... first noted on trace 1

segyread: discrepancy found in header and trace ns values
the value (60) was used to extract traces