Figure 23

The parameters of the effective Pomeron trajectory in exclusive ρ⁰ electroproduction, (a) α_ℙ(0) and (b) ${{\alpha }^{\prime }}_{\mathbb{P}}$, as a function of Q². The inner error bars indicate the statistical uncertainty, the outer error bars represent the statistical and systematic uncertainty added in quadrature. The band in (a) and the dashed line in (b) are at the values of the parameters of the soft Pomeron [19, 20].