Normalized monthly slpdmi values 
from jan58 dec99 (504). Standard Deviation =0.7
The index is preapred by taking the anomaly difference
bwtween slp of eastern (86-87E, 10S-9S) and 
western (44-45E, 15S-14S) Indian Ocean
 
     0.111
     0.854
     0.774
    -0.128
    -1.258
    -1.909
    -1.808
    -1.278
    -0.871
    -0.827
    -0.867
    -0.508
     0.364
     1.248
     1.359
     0.316
    -1.431
    -2.846
    -3.060
    -2.034
    -0.569
     0.336
     0.240
    -0.498
    -1.142
    -1.253
    -1.016
    -0.964
    -1.410
    -2.130
    -2.582
    -2.439
    -1.890
    -1.445
    -1.422
    -1.628
    -1.553
    -0.890
     0.099
     0.765
     0.647
    -0.077
    -0.682
    -0.492
     0.554
     1.846
     2.613
     2.539
     1.958
     1.484
     1.448
     1.658
     1.675
     1.310
     0.842
     0.750
     1.211
     1.850
     2.033
     1.431
     0.371
    -0.379
    -0.228
     0.742
     1.828
     2.259
     1.804
     0.908
     0.295
     0.373
     0.952
     1.464
     1.457
     0.927
     0.248
    -0.208
    -0.369
    -0.456
    -0.704
    -1.101
    -1.382
    -1.264
    -0.723
    -0.041
     0.394
     0.381
     0.043
    -0.274
    -0.268
     0.110
     0.641
     0.992
     0.934
     0.467
    -0.195
    -0.764
    -1.015
    -0.887
    -0.466
     0.078
     0.581
     0.934
     1.078
     0.985
     0.658
     0.163
    -0.342
    -0.645
    -0.594
    -0.217
     0.260
     0.545
     0.481
     0.178
    -0.062
     0.025
     0.445
     0.923
     1.110
     0.854
     0.316
    -0.164
    -0.338
    -0.227
    -0.071
    -0.100
    -0.339
    -0.617
    -0.742
    -0.681
    -0.566
    -0.547
    -0.624
    -0.653
    -0.497
    -0.185
     0.096
     0.171
     0.066
     0.010
     0.244
     0.780
     1.347
     1.577
     1.293
     0.655
     0.044
    -0.227
    -0.139
     0.041
    -0.016
    -0.451
    -1.130
    -1.748
    -2.033
    -1.889
    -1.403
    -0.775
    -0.226
     0.066
     0.005
    -0.378
    -0.913
    -1.346
    -1.457
    -1.184
    -0.656
    -0.107
     0.277
     0.452
     0.503
     0.548
     0.654
     0.825
     1.049
     1.334
     1.682
     2.033
     2.249
     2.181
     1.773
     1.116
     0.416
    -0.114
    -0.361
    -0.352
    -0.235
    -0.214
    -0.473
    -1.090
    -1.948
    -2.719
    -2.974
    -2.424
    -1.153
     0.336
     1.357
     1.447
     0.660
    -0.476
    -1.309
    -1.490
    -1.135
    -0.638
    -0.310
    -0.160
     0.008
     0.311
     0.600
     0.565
     0.047
    -0.753
    -1.369
    -1.421
    -0.925
    -0.268
     0.119
     0.115
    -0.025
     0.061
     0.474
     0.943
     1.059
     0.650
    -0.039
    -0.538
    -0.536
    -0.134
     0.262
     0.301
    -0.027
    -0.399
    -0.456
    -0.104
     0.433
     0.821
     0.888
     0.699
     0.423
     0.142
    -0.197
    -0.637
    -1.068
    -1.231
    -0.929
    -0.229
     0.527
     0.948
     0.882
     0.505
     0.152
     0.029
     0.067
     0.037
    -0.188
    -0.474
    -0.530
    -0.172
     0.474
     1.029
     1.145
     0.773
     0.197
    -0.184
    -0.155
     0.186
     0.542
     0.663
     0.517
     0.255
     0.053
    -0.036
    -0.083
    -0.164
    -0.263
    -0.278
    -0.133
     0.132
     0.368
     0.432
     0.305
     0.106
    -0.010
     0.032
     0.182
     0.337
     0.439
     0.520
     0.637
     0.779
     0.845
     0.737
     0.489
     0.312
     0.467
     1.048
     1.834
     2.373
     2.262
     1.447
     0.306
    -0.574
    -0.782
    -0.358
     0.247
     0.513
     0.221
    -0.400
    -0.872
    -0.845
    -0.358
     0.201
     0.393
     0.044
    -0.655
    -1.319
    -1.641
    -1.562
    -1.240
    -0.879
    -0.604
    -0.442
    -0.390
    -0.461
    -0.649
    -0.878
    -1.009
    -0.948
    -0.742
    -0.578
    -0.632
    -0.911
    -1.215
    -1.285
    -1.018
    -0.571
    -0.251
    -0.273
    -0.593
    -0.943
    -1.046
    -0.812
    -0.376
     0.041
     0.314
     0.474
     0.627
     0.826
     1.031
     1.170
     1.227
     1.245
     1.257
     1.222
     1.058
     0.745
     0.382
     0.126
     0.039
     0.010
    -0.159
    -0.541
    -0.958
    -1.079
    -0.697
     0.042
     0.688
     0.805
     0.320
    -0.401
    -0.842
    -0.746
    -0.324
    -0.069
    -0.334
    -1.026
    -1.679
    -1.831
    -1.398
    -0.722
    -0.279
    -0.305
    -0.647
    -0.953
    -0.996
    -0.839
    -0.724
    -0.795
    -0.939
    -0.894
    -0.516
     0.050
     0.451
     0.419
    -0.001
    -0.463
    -0.587
    -0.258
     0.294
     0.682
     0.667
     0.338
     0.033
     0.073
     0.521
     1.134
     1.535
     1.470
     0.955
     0.251
    -0.325
    -0.597
    -0.615
    -0.580
    -0.677
    -0.921
    -1.135
    -1.071
    -0.599
     0.175
     0.938
     1.358
     1.279
     0.811
     0.234
    -0.196
    -0.399
    -0.469
    -0.532
    -0.612
    -0.603
    -0.374
     0.087
     0.632
     1.047
     1.220
     1.232
     1.287
     1.538
     1.938
     2.252
     2.211
     1.717
     0.940
     0.233
    -0.069
     0.151
     0.717
     1.271
     1.468
     1.175
     0.526
    -0.163
    -0.592
    -0.642
    -0.423
    -0.173
    -0.082
    -0.183
    -0.361
    -0.489
    -0.550
    -0.651
    -0.915
    -1.338
    -1.750
    -1.920
    -1.720
    -1.222
    -0.644
    -0.187
     0.097
     0.312
     0.603
     1.033
     1.549
     2.033
     2.383
     2.540
     2.467
     2.139
     1.575
     0.885
     0.260
    -0.128
    -0.248
    -0.246
    -0.338
    -0.646
    -1.118
    -1.581
    -1.891
    -2.015
    -1.983
    -1.777
    -1.308
    -0.542
     0.344
     0.970
     0.991
     0.412
    -0.320
    -0.594
    -0.104