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Acceptance correction for the
non-identified tracks

In the task of finding the centrality of the physics trigger settings (discussed in section  4.2), the problem of obtaining $\,dN/\,d\eta$ of the spectrometer for comparison with the Si pad array arose. Technically, the solution was facilitated by the (quite artificial !) trick of assigning a pion mass to every particle regardless of its identity, then fitting the so obtained ``$k_T$'' distribution by the multitemperature formula  4.15 and extrapolating for every setting from $p_T=0$ to $p_T = \infty$ to get $\,dN/\,d\eta$.