[Gate-users] example_Radiotherapy/example3/data/linac-beam.root is what?

[肖期德]

Dear Gate users !

How is the root file 
".../examples/example_Radiotherapy/example3/data/linac-beam.root" 
generated ?
It only take space 4.7MB,and look like has lots of particles and many 
branches.
linac-beam.root.png
And,as the example3 shown , It genarate a root file of 13.6M,only 
include 599101 photons.
output.root
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