Worse compression ratio of igzip than gzip
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Description
Hi, I am testing igzip with big genomic data (in FASTQ format). As wished, igzip is much much faster than gzip, but the compression ratio is not as good as gzip.
```
igzip = 963083897
gzip = 843154757
```
All with default setting of compression level. And for igzip, there is very little difference of `igzip -2` and `igzip -3`, whereas `gzip -9` is much better than `gzip -6`
Any tips to improve the compression ratio?
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