%  Grid Data -- date from Illinois Aeromag map and 1977 Grid study
%  Random x-y locations and hand digitized magnetics (nT) values
%  L Braile 11/07/02
A = [5.6857 2.3342  505
    5.4463 5.1471  610
    5.5062 3.8304  820
    0.7781 4.1296  332
    1.0773 1.0174 -180
    0.6583 5.8054  322
    5.0274 4.5486  752
    5.6857 5.2668  595
    2.8728 4.6085  475
    4.3690 3.4713  792
    5.6857 5.9252  590
    2.9326 2.6932  468
    5.0274 1.4364  352
    2.0349 0.2993 -230
    3.8902 3.7107  820
    1.3766 1.1970 -128
    4.5486 4.4888  755
    4.6085 5.3865  592
    0.8379 4.7880  365
    0.8978 4.4289  355
    0.5985 2.3342   30
    0.7182 3.7107  250
    3.4713 1.5561  280
    4.7281 5.5062  595
    5.5660 3.1721  718
    5.9252 1.1970  325
    3.1721 5.8653  630
    0.0599 4.0100  210
    0.1795 5.5062  310
    2.7531 0.0599 -230
    0.3591 3.5311  140
    0.3591 2.9326  200
    0.1197 0.1795 -290
    5.0274 1.9152  438
    4.4289 2.3342  522
    4.7880 5.0873  610
    3.6508 1.4963  280
    3.8902 4.3092  780
    3.2319 3.1122  600
    0.4788 2.0947  -55
    2.5137 2.3940  325
    2.3940 2.0947  205
    1.2569 4.4888  375
    0.7781 0.1197 -278
    3.7706 0.7182  -20
    1.3766 5.8054  420
    3.7107 0.9576   50
    2.2743 3.0524  400
    2.8130 2.9326  482
    1.1371 4.9077  392
    5.2070 2.1546  455
    5.9252 2.6932  605
    0.8978 3.4115  225
    3.8902 3.6508  810
    0.1197 0.2993 -290
    1.6758 5.4463  455
    4.5486 3.6508  808
    4.4289 1.5561  395
    5.3267 2.6932  600
    2.4539 5.1471  460
    3.7706 2.5137  535
    2.2144 3.5311  462
    1.1970 1.4364 -130
    4.6085 0.5985   50
    0.5386 5.3267  358
    3.8304 0.7182  -15
    3.3516 1.6159  280
    5.8651 0.2394  132
    3.1721 1.6159  225
    5.1471 1.2569  320
    1.3766 2.5137  105
    1.9751 4.1895  405
    1.4963 4.8478  400
    0.5386 3.9501  275
    3.2319 3.5910  710
    5.4463 1.5561  365
    4.3690 3.2319  738
    4.3690 0.3591  -42
    5.0274 3.0524  690
    2.6334 4.7281  442
    2.2144 5.0274  435
    1.6159 2.5735  175
    5.8653 2.6334  590
    4.9675 5.8054  558
    3.7107 4.7880  578
    5.1471 3.2319  725
    1.1371 3.8304  348
    5.9252 5.0873  605
    1.6758 5.2668  442
    3.6508 3.8304  815
    1.0174 1.5561 -145
    0.8978 1.3167 -185
    3.8304 4.1895  820
    0.9576 4.4289  360
    2.3940 0.2394 -225
    1.5561 2.9925  248
    2.3342 1.4963   25
    3.6508 3.3516  725
    2.3342 4.0698  458
    2.4539 1.1371  -45
    5.4463 0.0599   40
    0.8978 0.2993 -258
    2.8728 1.7356  210
    3.4713 4.7281  550
    3.7706 0.7781    0
    5.6259 4.7880  705
    2.0349 3.1122  365
    0.4788 0.4189 -265
    5.0873 2.4539  520
    5.5660 3.1122  705
    0.5985 5.2668  365
    0.1795 1.3167 -255
    0.7781 3.1122  195
    4.4888 4.0698  830
    3.0524 0.4189 -145
    0.0599 1.1371 -280
    2.6334 3.4115  540
    2.8130 3.0524  505
    3.3516 2.9326  575
    1.4963 0.2394 -250
    0.2394 0.7182 -270
    0.5386 5.5062  342
    5.7456 3.0524  688
    5.2668 0.5985  162
    1.1970 3.1721  232
    3.9501 1.4963  325
    1.6758 4.7880  398
    5.7456 3.1721  710
    5.5660 2.9326  670
    2.6334 1.0773  -40
    1.6758 1.7955   15
    1.1371 0.3591 -245
    4.6085 0.0599  -75
    3.7706 2.8130  595
    1.0174 2.9925  187
    3.3516 0.6583  -60
    0.1795 5.4463  315
    3.7107 2.2743  502
    0.5386 4.0698  298
    5.3865 3.7107  805
    4.7880 0.5386   62
    4.4888 2.8728  640
    0.1197 5.6259  300
    2.4539 0.5386 -182
    5.8054 4.9675  640
    1.6758 2.3940  148
    1.5661 0.0599 -262
    2.8130 5.2668  505
    1.7955 4.6085  395
    3.6508 3.1721  675
    4.3092 2.2743  515
    4.4289 5.3267  582
    3.8902 2.3940  525
    1.8554 0.1197 -255
    2.0947 5.9252  550
    3.6508 2.2144  495
    4.9675 2.7531  618
    5.2070 2.7531  620
    1.9152 1.4963  -15
    0.0599 1.1970 -278
    1.0773 1.1970 -168
    0.2993 4.6683  315
    5.7456 5.5062  592
    4.0698 2.0349  488
    1.4963 5.4463  442
    4.3092 0.2394  -78
    5.1471 5.8054  545
    4.1296 1.9152  478
    4.9077 4.3092  782
    1.9751 0.0599 -258
    5.7456 3.8902  810
    5.3865 1.4963  358
    4.3092 5.7456  638
    5.2070 1.4963  360
    4.4888 4.7880  680
    3.2319 5.6259  580
    4.2493 1.4364  320
    0.3591 3.5910  155
    1.0773 2.5137   95
    2.9925 2.2743  415
    4.4888 3.3516  760
    1.4963 3.7107  382
    2.6932 2.4539  380
    1.4364 5.0873  422
    5.6857 2.1546  460
    0.6583 1.6758 -162
    1.0174 5.0873  398
    1.7955 2.8728  265
    3.6508 0.4788  -80
    3.5311 4.0100  800
    3.4713 2.9925  605
    1.4963 1.8554  -15
    0.1795 4.2493  275
    5.3865 1.7256  388
    1.0174 1.9751  -78
    3.2918 2.3342  475
    1.4963 5.0274  420
    4.7281 1.7955  440
    4.1895 4.3092  785
    2.3342 2.8130  370];
x = A(:,1);
y = A(:,2);
z = A(:,3);
%  End of data entry