my question on piRC tricubic spline of airebo potential in LAMMPS

Dear Authors of LAMMPS,
I run lammps with the airebo potential. I wonder weather the subroutines for the tricubic spline of piRC in airebo potential has some bugs.
To make things simple, I have considered the piRC sipline for an isotropically stretched graphene,in which the piRC can be reduced into piRC=F(2fc,2fc,1+8fc*fc), where fc is the cutoff function. Thus I can extract the spline subroutines of airebo from lammps source code and draw the curves of F,dFdx,dFdy and dFdz vs bond length with the parameters given in CH.airebo file.
I get curves which have some unsmooth and enven zigzag parttens at the range of bond length between 1.7 and 2.0 angstroms.
Yours sincerely
zehui
By the way, the version of lammps I use is lammps-9Nov11.
The following is the data with the columns being r, F, dFdx, dFdy, dFdz repectively. You can import it into some data-plotting software
to plot it.

1.700000 0.000000 0.000000 0.000000 0.000000
1.700800 0.000000 0.000003 0.000003 -0.000004
1.701600 0.000000 0.000013 0.000013 -0.000015
1.702400 0.000000 0.000029 0.000029 -0.000033
1.703200 0.000000 0.000051 0.000051 -0.000059
1.704000 0.000000 0.000079 0.000079 -0.000092
1.704800 0.000001 0.000114 0.000114 -0.000133
1.705600 0.000001 0.000154 0.000154 -0.000180
1.706400 0.000002 0.000201 0.000201 -0.000234
1.707200 0.000003 0.000254 0.000254 -0.000295
1.708000 0.000004 0.000313 0.000313 -0.000363
1.708800 0.000006 0.000378 0.000378 -0.000437
1.709600 0.000008 0.000448 0.000448 -0.000518
1.710400 0.000011 0.000524 0.000524 -0.000604
1.711200 0.000015 0.000606 0.000606 -0.000696
1.712000 0.000020 0.000693 0.000693 -0.000794
1.712800 0.000026 0.000786 0.000786 -0.000896
1.713600 0.000032 0.000884 0.000884 -0.001004
1.714400 0.000040 0.000987 0.000987 -0.001116
1.715200 0.000050 0.001095 0.001095 -0.001232
1.716000 0.000061 0.001208 0.001208 -0.001352
1.716800 0.000073 0.001326 0.001326 -0.001476
1.717600 0.000087 0.001448 0.001448 -0.001602
1.718400 0.000103 0.001576 0.001576 -0.001731
1.719200 0.000121 0.001707 0.001707 -0.001863
1.720000 0.000141 0.001844 0.001844 -0.001995
1.720800 0.000163 0.001984 0.001984 -0.002129
1.721600 0.000188 0.002129 0.002129 -0.002264
1.722400 0.000215 0.002278 0.002278 -0.002399
1.723200 0.000244 0.002432 0.002432 -0.002534
1.724000 0.000276 0.002589 0.002589 -0.002668
1.724800 0.000310 0.002751 0.002751 -0.002800
1.725600 0.000347 0.002916 0.002916 -0.002930
1.726400 0.000386 0.003086 0.003086 -0.003058
1.727200 0.000428 0.003259 0.003259 -0.003182
1.728000 0.000473 0.003437 0.003437 -0.003303
1.728800 0.000520 0.003618 0.003618 -0.003419
1.729600 0.000570 0.003803 0.003803 -0.003530
1.730400 0.000622 0.003992 0.003992 -0.003636
1.731200 0.000677 0.004185 0.004185 -0.003735
1.732000 0.000733 0.004381 0.004381 -0.003827
1.732800 0.000792 0.004581 0.004581 -0.003912
1.733600 0.000853 0.004785 0.004785 -0.003988
1.734400 0.000916 0.004992 0.004992 -0.004055
1.735200 0.000980 0.005202 0.005202 -0.004113
1.736000 0.001045 0.005416 0.005416 -0.004161
1.736800 0.001111 0.005633 0.005633 -0.004198
1.737600 0.001177 0.005854 0.005854 -0.004224
1.738400 0.001244 0.006077 0.006077 -0.004237
1.739200 0.001311 0.006302 0.006302 -0.004238
1.740000 0.001377 0.006530 0.006530 -0.004226
1.740800 0.001442 0.006761 0.006761 -0.004200
1.741600 0.001506 0.006993 0.006993 -0.004160
1.742400 0.001568 0.007226 0.007226 -0.004105
1.743200 0.001627 0.007461 0.007461 -0.004035
1.744000 0.001683 0.007695 0.007695 -0.003949
1.744800 0.001735 0.007930 0.007930 -0.003847
1.745600 0.001783 0.008165 0.008165 -0.003729
1.746400 0.001826 0.008398 0.008398 -0.003593
1.747200 0.001863 0.008628 0.008628 -0.003440
1.748000 0.001894 0.008857 0.008857 -0.003270
1.748800 0.001918 0.009081 0.009081 -0.003082
1.749600 0.001935 0.009302 0.009302 -0.003001
1.750400 0.001950 0.009521 0.009521 -0.002983
1.751200 0.001962 0.009739 0.009739 -0.002964
1.752000 0.001972 0.009956 0.009956 -0.002944
1.752800 0.001979 0.010171 0.010171 -0.002924
1.753600 0.001984 0.010384 0.010384 -0.002903
1.754400 0.001985 0.010595 0.010595 -0.002881
1.755200 0.001984 0.010805 0.010805 -0.002858
1.756000 0.001980 0.011011 0.011011 -0.002835
1.756800 0.001972 0.011215 0.011215 -0.002811
1.757600 0.001962 0.011416 0.011416 -0.002786
1.758400 0.001948 0.011615 0.011615 -0.002760
1.759200 0.001932 0.011810 0.011810 -0.002734
1.760000 0.001912 0.012001 0.012001 -0.002707
1.760800 0.001888 0.012189 0.012189 -0.002679
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1.763200 0.001797 0.012729 0.012729 -0.002592
1.764000 0.001760 0.012900 0.012900 -0.002562
1.764800 0.001719 0.013067 0.013067 -0.002530
1.765600 0.001674 0.013228 0.013228 -0.002499
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1.773600 0.001025 0.014527 0.014527 -0.002147
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1.780800 0.000130 0.015087 0.015087 -0.001791
1.781600 0.000014 0.015108 0.015108 -0.001750
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1.783200 -0.000227 0.015122 0.015122 -0.001667
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1.786400 -0.000743 0.015041 0.015041 -0.001501
1.787200 -0.000879 0.014997 0.014997 -0.001459
1.788000 -0.001016 0.014944 0.014944 -0.001418
1.788800 -0.001156 0.014881 0.014881 -0.001377
1.789600 -0.001298 0.014809 0.014809 -0.001335
1.790400 -0.001441 0.014727 0.014727 -0.001294
1.791200 -0.001588 0.014636 0.014636 -0.001152
1.792000 -0.001743 0.014540 0.014540 -0.000943
1.792800 -0.001906 0.014438 0.014438 -0.000766
1.793600 -0.002076 0.014327 0.014327 -0.000624
1.794400 -0.002250 0.014206 0.014206 -0.000518
1.795200 -0.002428 0.014073 0.014073 -0.000448
1.796000 -0.002607 0.013928 0.013928 -0.000417
1.796800 -0.002785 0.013770 0.013770 -0.000424
1.797600 -0.002961 0.013599 0.013599 -0.000469
1.798400 -0.003132 0.013417 0.013417 -0.000554
1.799200 -0.003298 0.013223 0.013223 -0.000678
1.800000 -0.003455 0.013019 0.013019 -0.000841
1.800800 -0.003601 0.012806 0.012806 -0.001042
1.801600 -0.003737 0.012589 0.012589 -0.001281
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1.804000 -0.004055 0.011932 0.011932 -0.002212
1.804800 -0.004126 0.011724 0.011724 -0.002589
1.805600 -0.004179 0.011528 0.011528 -0.002995
1.806400 -0.004211 0.011350 0.011350 -0.003430
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1.808000 -0.004213 0.011066 0.011066 -0.004373
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1.812800 -0.004624 0.010230 0.010230 0.001739
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1.819200 -0.007107 0.006027 0.006027 0.004944
1.820000 -0.007399 0.005321 0.005321 0.004675
1.820800 -0.007665 0.004612 0.004612 0.004295
1.821600 -0.007902 0.003914 0.003914 0.003814
1.822400 -0.008105 0.003240 0.003240 0.003248
1.823200 -0.008273 0.002608 0.002608 0.002609
1.824000 -0.008403 0.002031 0.002031 0.001911
1.824800 -0.008495 0.001525 0.001525 0.001169
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1.828800 -0.008409 0.000496 0.000496 -0.002089
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1.830400 -0.008287 0.000496 0.000496 -0.001425
1.831200 -0.008244 0.000468 0.000468 -0.001153
1.832000 -0.008211 0.000424 0.000424 -0.000918
1.832800 -0.008186 0.000365 0.000365 -0.000716
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1.834400 -0.008153 0.000215 0.000215 -0.000402
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1.839200 -0.008115 -0.000298 -0.000298 0.000008
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1.856000 -0.008209 -0.004700 -0.004700 0.002715
1.856800 -0.008209 -0.005292 -0.005292 0.002587
1.857600 -0.008192 -0.005871 -0.005871 0.002357
1.858400 -0.008157 -0.006432 -0.006432 0.002032
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1.896800 0.013103 0.018344 0.018344 -0.034543
1.897600 0.013355 0.019251 0.019251 -0.033748
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1.900800 0.014031 0.022492 0.022492 -0.030200
1.901600 0.014121 0.023201 0.023201 -0.029251
1.902400 0.014181 0.023867 0.023867 -0.028287
1.903200 0.014213 0.024492 0.024492 -0.027313
1.904000 0.014217 0.025074 0.025074 -0.026334
1.904800 0.014195 0.025613 0.025613 -0.025353
1.905600 0.014149 0.026111 0.026111 -0.024375
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1.936000 0.005240 0.022725 0.022725 -0.002131
1.936800 0.005016 0.022321 0.022321 -0.001948
1.937600 0.004798 0.021913 0.021913 -0.001778
1.938400 0.004585 0.021501 0.021501 -0.001620
1.939200 0.004377 0.021085 0.021085 -0.001474
1.940000 0.004176 0.020667 0.020667 -0.001339
1.940800 0.003980 0.020246 0.020246 -0.001214
1.941600 0.003791 0.019823 0.019823 -0.001100
1.942400 0.003607 0.019399 0.019399 -0.000994
1.943200 0.003429 0.018974 0.018974 -0.000897
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1.944800 0.003090 0.018122 0.018122 -0.000726
1.945600 0.002929 0.017695 0.017695 -0.000651
1.946400 0.002774 0.017270 0.017270 -0.000583
1.947200 0.002624 0.016845 0.016845 -0.000522
1.948000 0.002480 0.016421 0.016421 -0.000465
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