EV data.

EV_JDY:

is the global trigger time as a Julian date but rounded up onto 10MHz clock boundary. Note: for Monte Carlo data without packing and unpacking, it is rounded up only to a 20 nsec (50MHz) boundary.

EV_GTR:

is the global trigger time in 50Mhz clock time. For Monte Carlo data, packing and unpacking does not affect this value.

PT,

PMT_PT, FTxV_T: These are nsec times relative to the global trigger using the formula:-

time = GTR + t - 180

assuming the values for the trigger window and delay time from trigger card to FEC that prevailed when these notes were written.