[Gate-users] Asymmetric geometry PET on GATE

[Marina]

Dear GATErs

I am designing an asymmetrical PET geometry at GATE. I made 4 plates 
(p1,p2,p3,p4) at different positions and with differents sizes, each of 
them daughters of cylindricalPET:

/gate/cylindricalPET/daughters/name p_i
/gate/cylindricalPET/daughters/insert box

And 4 geometries for crystals (crystal1,crystal2,crystal3,crystal4):

/gate/p_i/daughters/name crystal_i
/gate/p_i/daughters/insert box

And 4 geometries for the layer (LYSO1,LYSO2,LYSO3,LYSO4):

/gate/crystal_i/daughters/name LYSO_i
/gate/crystal_i/daughters/insert box

When I attach it I make 4 different attach to same rsector, crystal and 
layer0. I mean:

/gate/systems/cylindricalPET/rsector/attach p2
/gate/systems/cylindricalPET/rsector/attach p1
/gate/systems/cylindricalPET/rsector/attach p3
/gate/systems/cylindricalPET/rsector/attach p4

(Same for crystal and layer0)

GATE give me an empty coincidences tree. Why is that?

Anyways, it gives me the Singles tree, and I would like to know if any 
of you have this issue and how manage to solve it in order to get the 
coincidences. It would be correct to implement externally the 
coincidence sorter from the Singles tree?

Thank you all!

Marina.