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Measurements of midrapidity charged particle multiplicity distributions,$dN_{\rm ch}/d\eta$, and midrapidity transverse-energy distributions,$dE_T/d\eta$, are presented for a variety of collision systems and energies.Included are distributions for Au$+$Au collisions at $\sqrt{s_{_{NN}}}=200$,130, 62.4, 39, 27, 19.6, 14.5, and 7.7 GeV, Cu$+$Cu collisions at$\sqrt{s_{_{NN}}}=200$ and 62.4 GeV, Cu$+$Au collisions at$\sqrt{s_{_{NN}}}=200$ GeV, U$+$U collisions at $\sqrt{s_{_{NN}}}=193$ GeV,$d$$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV, $^{3}$He$+$Au collisions at$\sqrt{s_{_{NN}}}=200$ GeV, and $p$$+$$p$ collisions at $\sqrt{s_{_{NN}}}=200$GeV. Centrality-dependent distributions at midrapidity are presented in termsof the number of nucleon participants, $N_{\rm part}$, and the number ofconstituent quark participants, $N_{q{\rm p}}$. For all $A$$+$$A$ collisionsdown to $\sqrt{s_{_{NN}}}=7.7$ GeV, it is observed that the midrapidity dataare better described by scaling with $N_{q{\rm p}}$ than scaling with $N_{\rmpart}$. Also presented are estimates of the Bjorken energy density,$\varepsilon_{\rm BJ}$, and the ratio of $dE_T/d\eta$ to $dN_{\rm ch}/d\eta$,the latter of which is seen to be constant as a function of centrality for allsystems.

Transverse energy production and charged-particle multiplicity at midrapidity in various systems from $\sqrt{s_{NN}}=7.7$ to 200 GeV