  We study the expected experimental mass distributions of dijet resonances
from excited quarks in proton-proton collisions at energies $\sqrt{s}=$ 13, 14,
27, 100, 300, and 500 TeV. We explore in detail the expected shapes at both the
generator and experimental levels, and identify within the distributions the
effects of the excited quark natural width, parton momentum distributions of
the proton, radiation, and experimental resolution. We present both
differential and cumulative probability distributions as a function of dijet
mass, and the signal acceptance of a window in dijet mass centered on each
resonance. We find that for a range of resonance masses, between 10\% and 50\%
of $\sqrt{s}$, the dijet mass distributions and window acceptance are
practically universal, approximately invariant under changes in resonance mass
and $\sqrt{s}$. This work supports our Snowmass 2021 study on the sensitivity
to dijet resonances at proton-proton colliders.
