to originate from the pattern of optical fibers in the scintillator trays and the positioning of readout electronics.

![Difference between measured and predicted time as a function of $\eta$ from LHC “beam splash” events. (a) Per-channel delay settings that compensate for timing variations along $\eta$ were loaded into the front-end electronics for the barrel (depths 1–2, $|\eta|<1.4$) but not for the endcap (depths 1–3, $|\eta|>1.4$) or outer (depth 4) calorimeters. Events from both $+z$ and $-z$ directions are included. (b) Compensating sample delay settings were loaded for all three calorimeters, barrel, endcap and outer. Only events from $+z$ direction were available and are included.[]{data-label="fig:uncorrectedVsCorrectedSplash"}](fig/uncorrectedSplashSept10 "fig:"){width="48.00000%"} ![Difference between measured and predicted time as a function of $\eta$ from LHC “beam splash” events. (a) Per-channel delay settings that compensate for timing variations along $\eta$ were loaded into the front-end electronics for the barrel (depths 1–2, $|\eta|<1.4$) but not for the endcap (depths 1–3, $|\eta|>1.4$) or outer (depth 4) calorimeters. Events from both $+z$ and $-z$ directions are included. (b) Compensating sample delay settings were loaded for all three calorimeters, barrel, endcap and outer. Only events from $+z$ direction were available and are included.[]{data-label="fig:uncorrectedVsCorrectedSplash"}](fig/correctedSplashSept18 "fig:"){width="48.00000%"}

From these data, $\eta$-dependent sampling delays were derived 