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General idea of the procedure

Based on the discussion in the previous sections, one can foresee two directions that lead to the correct determination of the $c$-sample:

1. direct (or indirect) counting of events that satisfy the set of conditions which makes up the $c$-sample (see the definition in section  4.2.1). In NA44, the criterion of the $c$-sample has no direct hardware implementation. I invested a lot of effort into attempts to quantify the difference between the $c$-sample and the samples that do have direct hardware implementation (various trigger modes), by analyzing properties of the latter (e.g., correlations between the amplitudes of left and right T0 scintillators). Dissatisfaction with this path of analysis eventually led me to prefer the following idea:
2. there is a device that does not need the operation of average (as in equation (4.16)) and, therefore, the ``normalization sample'', to get the multiplicity. The Si pad array measures multiplicity of individual events, event-by-event. For any trigger mode, no matter how complex it is, the Si can give multiplicity of each event taken and thus the average multiplicity. The left-hand side of equation (4.16) becomes known, and so one determines the $c$ of the trigger (given $i$).