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Asymptotic boundary condition



Hello
I tried to make a simple simulation to verify the
asymptotic b.c.
I take a coil with a current and I simulate the B
field at 1 m on axis (B1) and 90° off axis (B2). In
the field produced by a dipole the ratio between B1
and B2 should be 3 but with the mixed b.c. and the
appropriate c0 I find that the ratio is nearly 2. 
I make an error somewhere?




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[Format] = 3.0
[Frequency] = 0
[Precision] = 1e-008
[LengthUnits] = millimeters
[ProblemType] = axisymmetric
[Coordinates] = cartesian
[Comment] = "Spira percorsa da corrente.\n"
[PointProps] = 0
[BdryProps] = 1
<BeginBdry>
<BdryName> = "New Boundary"
<BdryType> = 2
<A_0> = 0
<A_1> = 0
<A_2> = 0
<Phi> = 0
<c0> = 796000
<c1> = 0
<Mu_ssd> = 0
<Sigma_ssd> = 0
<EndBdry>
[BlockProps] = 2
<BeginBlock>
<BlockName> = "Copper"
<Mu_x> = 1
<Mu_y> = 1
<H_c> = 0
<H_cAngle> = 0
<J_re> = 10
<J_im> = 0
<Sigma> = 58
<d_lam> = 0
<Phi_h> = 0
<LamType> = 0
<LamFill> = 1
<BHPoints> = 0
<EndBlock>
<BeginBlock>
<BlockName> = "Air"
<Mu_x> = 1
<Mu_y> = 1
<H_c> = 0
<H_cAngle> = 0
<J_re> = 0
<J_im> = 0
<Sigma> = 0
<d_lam> = 0
<Phi_h> = 0
<LamType> = 0
<LamFill> = 1
<BHPoints> = 0
<EndBlock>
[CircuitProps] = 0
[NumPoints] = 6
50	0	0	0
60	0	0	0
0	100	0	0
0	-100	0	0
0	1000	0	0
0	-1000	0	0
[NumSegments] = 3
4	2	-1	0	0	0
2	3	-1	0	0	0
3	5	-1	0	0	0
[NumArcSegments] = 4
0	1	180	5	0	0	0
1	0	180	5	0	0	0
3	2	180	10	0	0	0
5	4	180	10	1	0	0
[NumHoles] = 0
[NumBlockLabels] = 3
55	1	1	1	0	0	0
410	470	2	20	0	0	0
40	50	2	10	0	0	0