# paste this code at the end of VectorFieldPlot 3.3# https://commons.wikimedia.org/wiki/User:Geek3/VectorFieldPlotdoc = FieldplotDocument('VFPt_Solenoid_correct',    width=490, height=200, unit=100, commons=True, bg_color=None)doc.arrow_geo = {'x_nock':-2, 'x_head':4, 'x_tail':-2, 'width':4}R = 0.49L = 1.96field = Field([ ['coil', {'x':0, 'y':0, 'phi':0, 'R':R, 'Lhalf':L/2, 'I':1}] ])nlines = 6for iline in range(nlines):    a = 0.33 * (-1 + 2 * (0.5 + iline) / nlines)    line = FieldLine(field, [0, a], directions='both', maxr=3.5)    doc.draw_line(line, linewidth=1.0, arrows_style={        'min_arrows':3, 'max_arrows':3, 'scale':2,        'offsets':{'start':1, 'leave_image':0.25, 'enter_image':0.25, 'end':1} })current_out = doc.draw_object('g', {'id':'current_out'}, group=doc._get_defs())doc.draw_object('circle', {'cx':'0', 'cy':'0', 'r':12.5, 'fill':'#ffffff',    'stroke':'#000000', 'stroke-width':3}, group=current_out)doc.draw_object('circle', {'cx':'0', 'cy':'0', 'r':2.6, 'fill':'#000000',    'stroke':'none'}, group=current_out)current_in = doc.draw_object('g', {'id':'current_in'}, group=doc._get_defs())doc.draw_object('circle', {'cx':'0', 'cy':'0', 'r':12.5, 'fill':'#ffffff',    'stroke':'#000000', 'stroke-width':3}, group=current_in)doc.draw_object('path', {'d':"M -8.8,-8.8 L 8.8,8.8 M -8.8,8.8 L 8.8,-8.8",    'fill':'none', 'stroke':'#000000', 'stroke-width':3}, group=current_in)for x in sc.linspace(-0.84, 0.84, 7):    doc.draw_object('use', {'{http://www.w3.org/1999/xlink}href':'#current_out',        'transform':"translate({:.3f},{:.3f}) scale(0.01, 0.01)".format(x, R)})    doc.draw_object('use', {'{http://www.w3.org/1999/xlink}href':'#current_in',        'transform':"translate({:.3f},{:.3f}) scale(0.01, 0.01)".format(x, -R)})doc.write()