  The parton model relations in conjunction with quark-hadron duality in deep
inelastic scattering suggests an asymptotic dominance of quark-diquark type of
baryonic excited states with a radial Regge uniformly distributed mass squared
spectrum $M_{n}^2 = \mu^2 n + M_0^2$. We argue that this points to a lineary
quark-diquark confining potential. We analyze the radial ($n$) and
angular-momentum ($J$) Regge trajectories for all light-quark states with
baryon number one listed in the 2016 edition of the Particle Data Tables. The
parameters of the mass squared trajectories are obtained by linear regression
assuming $\Delta M_n^2 \sim M_n \Gamma_n $ weighted with the width $\Gamma_n$
of the resonance and the error analysis is carried out accordingly.
