The START command defines the initial coordinates of the particles to be tracked. There may be many START statements, one for each particle. Particles are always started with coordinates relative to the computed closed orbit for the defined energy error. The command format is:
START,X=real,PX=real,Y=real,PY=real,T=real,DELTAP=real; START,FX=real,PHIX=real,FY=real,PHIY=real,FT=real,PHIT=real;START statements must be entered after the TRACK command, but before the RUN command.