Figure 3: Energy dependence of in proton-proton (a, b) and proton-antiproton (c, d) elastic scattering for linear (a, c) and quadratic (b, d) exponential parametrization of differential cross-section. Experimental points from fitted samples are indicated as close/open circles (squares) for    for (a, c)/(b, d); unfitted points are indicated as . The dot curve is the fit of experimental slope by the function (4a), thick solid—by (4b), dashed—by (4c), and thin solid—by (4d). The shaded band (a) corresponds to the spread of fitting functions for previous analysis [9].