Figure 21

Number of data taking runs terminated due to failure in the HLT during \run{1} and \run{2} since 2011, when the TPC data compression in the HLT was introduced Missing months correspond to long shutdowns, end-of-year shutdowns, commissioning phases for the data compression and recommissioning for updated TPC readout The yearly averages are shown as long tick marks along the right-side y-axis