All statistics are based on contigs of size >= 500 bp, unless otherwise noted (e.g., "# contigs (>= 0 bp)" and "Total length (>= 0 bp)" include all contigs).
Suggestion: all assemblies contain continuous fragments of N's of length >= 10 bp. You may consider rerunning QUAST using --scaffolds (-s) option!

Assembly     # contigs (>= 0 bp)  # contigs (>= 1000 bp)  # contigs (>= 5000 bp)  # contigs (>= 10000 bp)  # contigs (>= 25000 bp)  # contigs (>= 50000 bp)  Total length (>= 0 bp)  Total length (>= 1000 bp)  Total length (>= 5000 bp)  Total length (>= 10000 bp)  Total length (>= 25000 bp)  Total length (>= 50000 bp)  # contigs  Largest contig  Total length  GC (%)  N50      N75     L50  L75    # N's per 100 kbp
duck4-10k.1  15361                15361                   15361                   15361                    3350                     1541                     1397407710              1397407710                 1397407710                 1397407710                  1225188922                  1164206709                  15361      13378076        1397407710    33.75   1607401  373014  216  627    14275.16         
duck4-10k.2  15356                15356                   15356                   15356                    3347                     1541                     1396117256              1396117256                 1396117256                 1396117256                  1223948455                  1163079517                  15356      13404639        1396117256    33.75   1615007  372478  216  627    14288.10         
duck4.1      315013               315013                  50433                   15361                    3350                     1541                     2205550088              2205550088                 1634904607                 1397407710                  1225188922                  1164206709                  315013     13378076        2205550088    33.92   177022   4745    834  54388  9137.01          
duck4.2      315011               315011                  50430                   15356                    3347                     1541                     2204281463              2204281463                 1633635896                 1396117256                  1223948455                  1163079517                  315011     13404639        2204281463    33.91   172688   4743    837  54452  9142.12