Hi Martin, Thank you again. > Which version of root and geant are you using ? root : root_v3.10.02 geant: geant4.5.2.p02 > Is the lmf library (libLMF.a) created ? Yes, it is in /opt/lmf/lib/ and /usr/src/lmf/lib/ I hope this information will help and I am looking forward for your input again. Ciao, Irene