• First week calibration with hadrons --> Beam quality not important 
• Last week hadrons 50 GeV/c --> Two XCETs necessary, to be confirmed by NA64e
  • That it is OK if the XCETs are located in PPE124
  • That the signal can reach their CR in CZ 
  • They need to confirm the gases needed, e-mails already exchanged with L-M. Bueno on the subject.