See this blog Why You Should Care About Segmental Duplications for some nice explanation.

vtools show annotation genomicSuperDups -v2
Annotation database genomicSuperDups (version hg19_20130626)
Description:            Duplications of >1000 Bases of Non-RepeatMasked
  Sequence (>90 percent similar).
Database type:          range
Number of records:      51,599
Distinct ranges:        40,832
Reference genome hg19:  chr, start, end

Field:                  chr
Type:                   string
Comment:                Reference sequence chromosome or scaffold
Missing entries:        0
Unique Entries:         80

Field:                  start
Type:                   integer
Comment:                Start position in chromosome
Missing entries:        0
Unique Entries:         30,451
Range:                  1 - 249235635

Field:                  end
Type:                   integer
Comment:                End position in chromosome
Missing entries:        0
Unique Entries:         30,690
Range:                  1832 - 249240008

Field:                  name
Type:                   string
Comment:                Other chromosome involved
Missing entries:        0
Unique Entries:         30,525

Field:                  otherChr
Type:                   string
Comment:                Other chromosome or scaffold
Missing entries:        0
Unique Entries:         80

Field:                  otherStart
Type:                   integer
Comment:                Start position of other region
Missing entries:        0
Unique Entries:         30,451
Range:                  0 - 249235634

Field:                  otherEnd
Type:                   integer
Comment:                End position in chromosome
Missing entries:        0
Unique Entries:         30,690
Range:                  1832 - 249240008

Field:                  otherSize
Type:                   integer
Comment:                Total size of other chromosome
Missing entries:        0
Unique Entries:         80
Range:                  19913 - 249250621

Field:                  alignL
Type:                   integer
Comment:                spaces/positions in alignment
Missing entries:        0
Unique Entries:         13,141
Range:                  1001 - 777920

Field:                  indelN
Type:                   integer
Comment:                number of indels
Missing entries:        0
Unique Entries:         436
Range:                  0 - 993

Field:                  indelS
Type:                   integer
Comment:                indel spaces
Missing entries:        0
Unique Entries:         4,617
Range:                  0 - 92315

Field:                  matchB
Type:                   integer
Comment:                aligned bases that match
Missing entries:        0
Unique Entries:         12,497
Range:                  1000 - 766171

Field:                  mismatchB
Type:                   integer
Comment:                aligned bases that do not match
Missing entries:        0
Unique Entries:         12,623
Range:                  900 - 766171

Field:                  transitionsB
Type:                   integer
Comment:                number of transitions
Missing entries:        0
Unique Entries:         2,659
Range:                  0 - 9703

Field:                  transversionsB
Type:                   integer
Comment:                number of transversions
Missing entries:        0
Unique Entries:         1,880
Range:                  0 - 5953

Field:                  fracMatch
Type:                   float
Comment:                fraction of matching bases
Missing entries:        0
Unique Entries:         1,442
Range:                  0 - 4002

Field:                  fracMatchIndel
Type:                   float
Comment:                fraction of matching bases with indels
Missing entries:        0
Unique Entries:         21,193
Range:                  0.9 - 1

Field:                  jcK
Type:                   float
Comment:                K-value calculated with Jukes-Cantor
Missing entries:        0
Unique Entries:         21,393
Range:                  0.88604 - 1

Field:                  k2K
Type:                   float
Comment:                Kimura K
Missing entries:        0
Unique Entries:         23,215
Range:                  0 - 0.107326