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Table 3 Overview of the reserved columns in the GTrack format and their associations to track type

From: Identifying elemental genomic track types and representing them uniformly

Core property:    Gaps Lengths Values    Interc.
GTrack column(s): genome seqid start end 1 value strand id edges 2
Type of column: N N C C C N N C
Track type         
Points (P) ? ! . . ? ? .
Segments (S) ? ! . ? ? .
Genome Partition (GP) ? ! . . ? ? .
Valued Points (VP) ? ! . ? ? .
Valued Segments (VS) ? ! ? ? .
Step Function (SF) ? ! . ? ? .
Function (F) ? ! . . ? ? .
Linked Points (LP) ? ! . . ?
Linked Segments (LS) ? ! . ?
Linked Genome Partition (LGP) ? ! . . ?
Linked Valued Points (LVP) ? ! . ?
Linked Valued Segments (LVS) ? ! ?
Linked Step Function (LSF) ? ! . ?
Linked Function (LF) ? ! . . ?
Linked Base Pairs (LBP) ? ! . . ?
  1. C Core reserved column (defines track type)
  2. N Non-core reserved column (reserved, but does not define track type)
  3. Column is mandatory
  4. ? Column is optional
  5. . Column is not allowed
  6. ! Property must be present, either as a column or in a bounding region specification
  7. 1 The length is the difference between the end and the start position, or, if the start column is not present, the difference between the current end position and the previous.
  8. 2 The non-core reserved column id is required when the edges column is present.