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Table 1 Coefficients obtained by the ANN and LSM algorithms for an EFM system

From: The use of artificial neural networks in electrostatic force microscopy

Coefficients	ANN	LSM
q _i
q1	−0.26	417.40
q2	1.75	−2.31
q3	−1.54	2.43
q4	0.98	−0.82
L _i
L1	−0.032	−12,582.71
L2	−0.15	2,194.47
L3	−0.30	−157.42
L4	0.90	5.51
L5	0.41	0.015
L6	0.13	0.48
L7	1.32	−0.39
L8	−7.31	26.26
L9	10.16	−445.25
L10	11.51	3,126.11
L11	7.75	−9,298.52
L12	4.42	9,311.48

L = 10 R, θ = 20°, D = 0.1 R, and ϵ = 10. q_i and L_i correspond to punctual charges and charged segments inside the tip, respectively.

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