I have a bunch of .gz files I'm checking the integrity after data transfer with gzip -t -v file
the output I'm getting is

```
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
....
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
OK

```

What do these repeated lines indicate and how I get just the final OK as output?