Fields not properly set in GrandRoot files from simulations

[ifleg]

Some fields are not properly set in GrandRoot files from simulations.
The list of fields can be found here https://box.in2p3.fr/s/imnbGopkjxriqLT (read-only)
or here https://box.in2p3.fr/f/28691766 (read-write for Matias and Lech)

[luckyjim]

Please, add TBranch
"xmax_pos"
in TTree tshower, file shower_xxxx.root to the list
https://box.in2p3.fr/s/imnbGopkjxriqLT
xmax_pos is set to (0,0,0) everywhere in DC2