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Update clic/clusters/v1.9.0/README.md

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@@ -78,6 +78,7 @@ The truth and target definition was updated in [jpata/particleflow#345](https://
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  In particular, target particles for MLPF reconstruction are based on `status=1` particles.
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  For non-interacting `status=1`, nearby (dR<0.2) interacting `status=0` are used instead.
 
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  The datasets were generated using Key4HEP with the following scripts:
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  - https://github.com/HEP-KBFI/key4hep-sim/releases/tag/v1.0.0
 
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  In particular, target particles for MLPF reconstruction are based on `status=1` particles.
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  For non-interacting `status=1`, nearby (dR<0.2) interacting `status=0` are used instead.
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+ It's important to note that truth and target jets are defined in the center of mass frame, whereas PF particles are defined in the lab frame: https://github.com/key4hep/k4geo/issues/399#issuecomment-2381714391.
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  The datasets were generated using Key4HEP with the following scripts:
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  - https://github.com/HEP-KBFI/key4hep-sim/releases/tag/v1.0.0