This does it
fprintf('%8s\t\t%8s\t\t%8s\t\t%8s\n', 'alfa', 'x[mm]', 'P[bar]', 'V[l]' )
fprintf('%8.4f\t\t%8.4f\t\t%8.4f\t\t%8.4f\n',[alfa_cont, x, P, V]')
alfa x[mm] P[bar] V[l]
0.0000 0.0000 0.9000 0.0449
10.0000 0.7455 0.9000 0.0486
20.0000 2.9447 0.9000 0.0597
....
100.0000 50.2820 0.9000 0.2976
110.0000 56.2807 0.9000 0.3278
120.0000 61.6320 0.9000 0.3547
Mixing tabs a spaces is not robust. Depends on the settings of the tabs-positions.