geometry and fiber lengths of the final barrel detector, a set of final sampling delay settings could be derived. Section \[sec:splash\] discusses the performance of these settings with LHC beam data. The HCAL timing resolution was determined by removing the channel-to-channel variations and combining the data. A Gaussian function was then fitted to the distribution of the leading energy deposit from each event, producing a best-fit width of $\sigma=1.2$ ns (Fig. \[fig:Tspread\]). This result is consistent with the expected effect of the uncorrectable sources of timing spread described in Sec. \[subsec:sources\], averaged over many hadronic shower events. The measured resolution is consistent across the full set of channels studied.

The variation of HCAL timing resolution as a function of energy was also measured with pion beam data. In this measurement the HCAL unit under test was paired with its corresponding section of the ECAL in front, as in the CMS detector. Events in two categories were considered: those with no interaction in the ECAL ($<$1 energy deposited) and those with a significant interaction ($>$5 energy deposited). The results indicate that the presence of the ECAL does not substantially alter the timing resolution of the HCAL as a function of energy 