Non-dimensionalised streamwise pressure gradient along the centreline.
Experimental data extracted from Tassone (2019)

y/R [-], -dpdy/(sigma u B^2) [-]
-1.474087E+01,  2.600141E-02
-1.446875E+01,  2.627608E-02
-1.400000E+01,  2.563403E-02
-1.345386E+01,  2.557350E-02
-1.321875E+01,  2.563403E-02
-1.253122E+01,  2.603538E-02
-1.195315E+01,  2.603500E-02
-1.118920E+01,  2.595802E-02
-1.034077E+01,  2.550202E-02
-9.827446E+00,  2.595802E-02
-9.236158E+00,  2.581077E-02
-8.388059E+00,  2.557424E-02
-7.991593E+00,  2.512928E-02
-7.467011E+00,  2.513359E-02
-6.864627E+00,  2.488186E-02
-6.159882E+00,  2.453712E-02
-5.612628E+00,  2.422401E-02
-5.069232E+00,  2.415185E-02
-4.593750E+00,  2.383628E-02
-3.846397E+00,  2.305066E-02
-3.327585E+00,  2.216084E-02
-2.870562E+00,  2.172938E-02
-2.156133E+00,  2.088802E-02
-1.580371E+00,  2.084334E-02
-1.049964E+00,  2.099511E-02
-6.159583E-01,  2.011099E-02
-3.437500E-01,  1.947030E-02
2.800737E-02,  1.836263E-02
3.362639E-01,  1.690014E-02
6.367648E-01,  1.565469E-02
9.232337E-01,  1.480355E-02
9.601233E-01,  1.403696E-02
1.110211E+00,  1.262122E-02
1.375000E+00,  1.112360E-02
1.687500E+00,  9.839486E-03
1.841773E+00,  8.648575E-03
1.937500E+00,  7.335474E-03
2.062500E+00,  6.693419E-03
2.160137E+00,  6.476285E-03
2.187500E+00,  5.601926E-03
2.604011E+00,  4.564915E-03
3.108378E+00,  3.239023E-03
3.406250E+00,  2.006421E-03
3.705461E+00,  1.557507E-03
4.000000E+00,  1.107544E-03
4.446790E+00,  7.425136E-04
4.939380E+00,  1.254948E-04
5.668265E+00, -3.496910E-04
6.156860E+00,  3.083158E-05
6.669145E+00, -3.835477E-04
6.968750E+00,  8.025682E-05
7.483792E+00,  1.873965E-04
8.056999E+00,  9.118947E-05
8.625000E+00,  1.444623E-04
8.880872E+00,  4.200605E-05
9.678165E+00, -6.556060E-05