I ran abyss on a dataset and obtained the following stats. What do the various columns mean?

```
n n:200 n:N50 min N80 N50 N20 max sum
8540100 682221 169533 200 288 513 1064 24662 313.4e6 a-unitigs.fa
7186547 447932 89602 200 512 984 2259 688516 352.9e6 a-contigs.fa
7126108 387493 71262 200 584 1208 2810 1552973 352.1e6 a-scaffolds.fa
```

n is the total number of sequences in the fasta file, this I verified, N50, N80 etc are the N50 lengths and so on but what is the 'sum' column indicating and what is n:N50?

Would it be possible that the "sum" column is the number of reads that were successfully assembled ? It would make sense, but I am not 100% sure though. But it's very probable.

The number exceeds the total number of reads given to it, so it can't be that.