# paste this code at the end of VectorFieldPlot 1.2
doc = FieldplotDocument('VFPt_dipole_electric_manylines',
    commons=True, width=600, height=600)
field = Field({'monopoles':[[-0.5,0,-1], [0.5,0,1]]})
doc.draw_charges(field, scale=1.5)
n = 32
for i in range(n):
    phi = 2.0 * pi * (i + 0.5) / n
    line = FieldLine(field, [0.5,0], start_v=[cos(phi), sin(phi)],
        directions='forward', maxr=1e4)
    if i in [11, 13, 15, 16, 18, 20]: max_arrows = 0
    else: max_arrows = None
    doc.draw_line(line, linewidth=2,
        arrows_style={'dist':1.8, 'scale':1.1, 'max_arrows':max_arrows})
doc.write()