The .gtf file contains MVP mapping data for the Human Epigenome Project (HEP) in the format described below.

Data are arranged in 10 columns as follows:
ColumnDate typeValues in HEP1_data.gtf
1feature_classESME
2identity(unique, see below)
3typeCpG
4sub-typeAnalysis, Trace, Variation
5chromosome6, 20, 22
6chr_startbase position
7chr_endbase position
8orientation+
9phase.
10methylation
score
0-100
. = 'no data'
-1 = 'data not analysed'

Column 2 may be decoded thus:

The Analysis co-ordinates are those of the amplicon of the given Sanger:epi_id_number.

'CpG Variation' refers to the position of the C of each CpG.