[Gate-users] About ASCCI Singles output

[open researcher]

I want some clarifications regarding the output of Singles output -
1. What does XYZ position of the annihilation in world referential mean. (I
have defined a source at 0, -22, 0 cms (and y axis is depth axis) and a NaI
crystal at -15 cm. Singles file has readings like 0.000e+00 -2.200e+02
 0.000e+00 since the interaction is happening in the crystal I think the
y-coordinate must be -15 cm I don't know how it is showing the coordinate
of the source)
2. XYZ position of the single in the world referential shows (0, 1, 0) for
some singles, (0, 2, 0) for some and (0, 0, 0) for some singles. what can I
infer from this ?
3. for some Singles time stamp is -ve  (what can it mean ?)
4. what are Volume IDs ?
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