processor Frs/TofSystem   FRS.TofSystemTacCal
        dt_S2lr <- FrsCrate.adc0[0]
        dt_S4lr <- FrsCrate.adc0[1]
.....
end

processor Frs/ScintChecks/S2_x_vs_x  UTILS.Pair
        first  <- Frs/TofSystem.dt_S2lr
        second <- Frs/S2tracking.xs[1]  ##check where are you projecting according to your S2tracking.par file
        display first:second in S2pos_checks  1000,2000,2500:500,-20,20 ## check the range or leave it smart to start
end

processor Frs/ScintChecks/S2_calx_vs_x  UTILS.Pair
        first  <- Frs/TofSystem.x_time_S2
        second <- Frs/S2tracking.xs[1]
        display first:second in S2pos_checks  500,-20,20:500,-50,50
end