This is the ntuple content:
Variable Dimension Type Bits Description
NRUN - INTEGER 32 The run number
IEVT - INTEGER 32 The event number
TIME - INTEGER 32 The time of the event
DATE - INTEGER 32 The date of the event
TIMREL - INTEGER 32 Number of system clocks since start
NUMSOB - INTEGER 32 The number of start of bursts so far
NEVTB - INTEGER 32 Event number within the burst
ITDC (8) INTEGER 32 The 8 TDC values, clock counts.
TDC (8) REAL 32 The 8 TDC values, decoded to ns.
NH - INTEGER 32 The number of hits, cut at 40.
ICOD (NH) INTEGER 6 The detector codes of each hit.
INUM (NH) INTEGER 4 The module number of each hit;
1 is the first module, 2 the 2nd etc.
ICHA (NH) INTEGER 11 The channel address of the hit.
IXYF (NH) INTEGER 2 For telescope, is this x or y?
0 indicates an x hit, 1 a y hit.
HSIG (NH) REAL 13 Total signal in the hit over the noise on one strip.
HETA (NH) REAL 10 The hit eta, 0 - 1
The ratio of pulse heights.
HXLO (NH) REAL 16 The x local, cm, -0.1 - 3.3
NTR - INTEGER 32 The number of tracks, cut at 4.
TRX (NTR) REAL 32 The track x at z=0
TRY (NTR) REAL 32 The track y at z=0
TRGX (NTR) REAL 32 The track dx/dz
TRGY (NTR) REAL 32 The track dy/dz
TRCHI2 (NTR) REAL 32 The track dy/dz
There is also the detectors raw data, in whatever format they have picked.
The track information is a minimum set, giving the track directions but not
which detector planes were used to fit it. People wanting more detailed track
information should refit them using VIFTRK.