Citation:

cp-9-2713-2013

Name: Concentration of hydrogen ions measured with the Electrical Conductivity Method (ECM) on the NGRIP ice core
Published: 2013
License: https://creativecommons.org/licenses/by/3.0/

Always quote citation above when using data! You can download the citation in several formats below.

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Source:

Dahl-Jensen, Dorthe; Rasmussen, Sune Olander; Clausen, Henrik Brink; Steffensen, Jørgen Peder; Svensson, Anders M; Vallelonga, Paul T; Vinther, Bo Møllesøe; Winstrup, Mai (2013): NGRIP ice core ECM Data. World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program, ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/ngrip2013ecm.txt

Other version:

Rasmussen, Sune Olander; Abbott, Peter M; Blunier, Thomas; Bourne, Anna J; Brook, Edward J; Buchardt, Susanne L; Buizert, Christo; Chappellaz, Jérôme A; Clausen, Henrik Brink; Cook, Eliza; Dahl-Jensen, Dorthe; Davies, Siwan M; Guillevic, Myriam; Kipfstuhl, Sepp; Laepple, Thomas; Seierstad, Inger K; Severinghaus, Jeffrey P; Steffensen, Jørgen Peder; Stowasser, Christopher; Svensson, Anders M; Vallelonga, Paul T; Vinther, Bo Møllesøe; Wilhelms, Frank; Winstrup, Mai (2013): NOAA/WDS Paleoclimatology - NEEM Ice Core NEEM-1 Time Scale. NOAA National Centers for Environmental Information, https://doi.org/10.25921/GAB6-FA09

Project(s):

North Greenland Ice Core Project (NGRIP)

Coverage:

Latitude: 75.100000 * Longitude: -42.320000

Date/Time Start: 1996-07-01T00:00:00 * Date/Time End: 1996-07-01T00:00:00

Minimum DEPTH, ice/snow: 9.84 m * Maximum DEPTH, ice/snow: 3084.99 m

Event(s):

NGRIP (NorthGRIP) * Latitude: 75.100000 * Longitude: -42.320000 * Date/Time: 1996-07-01T00:00:00 * Elevation: 2917.0 m * Location: Greenland * Campaign: * Basis: Sampling/drilling ice * Method/Device: Ice drill (ICEDRILL)

Comment:

The ECM data has been temperature corrected to a standard temperature of -14 °C, according to an Arrhenius relationship using an activation energy of 0.23 eV. Subsequently, the measured current has been converted to ice acidity using the relationship suggested by Hammer (1980). For more information on the calibration procedure see Rasmussen et al, 2013.

Due to the manual approach of the applied ECM technique depth assignment is only accurate to within 1-2 cm. Data in areas of breaks have been removed from the resulting data sets, and data has been downsampled to 1 cm resolution.

The ECM data was obtained in the field during the NGRIP field seasons. It consists of data from NGRIP1 (9.84-1371.69 m depth) and NGRIP2 (1346.41-3084.99 m depth). The NGRIP1 core reaches down to a depth of 1372 m. The NGRIP2 core (drilled 20 meters away from the NGRIP1 core) reaches from surface to bedrock, but high-resolution measurements have only been carried out downwards from 1346 m. In the 26 m overlap zone, the cores are offset by 0.43 m on average, probably due to uncertainties in the logging procedure (see Schøtt Hvidberg et al., Ann. Glac. 35, 2002). Thus, the same features appear at larger depths in the NGRIP1 than in the NGRIP2 core. When combining NGRIP1 and NGRIP2 data, the recommended switching point from NGRIP1 to NGRIP2 is the year 9830b2k (NGRIP1 depth: 1371.47 m, NGRIP2 depth 1371.070 m).

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, ice/snow	Depth ice/snow	m			Geocode
2	Hydrogen ion concentration	H+	µeq/kg	Dahl-Jensen, Dorthe	Electrical conductivity method, ECM (Hammer, 1980)	NGRIP1
3	Hydrogen ion concentration	H+	µeq/kg	Dahl-Jensen, Dorthe	Electrical conductivity method, ECM (Hammer, 1980)	NGRIP2

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

308165 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Depth ice/snow [m]	2 H+ [µeq/kg] (NGRIP1)	3 H+ [µeq/kg] (NGRIP2)
9.84	0.567314
9.85	0.702836
9.86	0.588455
9.87	0.688504
9.88	0.569082
9.89	0.795736
9.90	0.883647
9.91	1.039670
9.92	1.053460
9.93	1.135210
9.94	1.104970
9.95	1.025520
9.96	0.672454
9.97	0.497909
9.98	0.524936
9.99	0.383149
10.00	0.391697
10.01	0.463982
10.02	0.495506
10.03	0.440431
10.04	0.678696
10.05	0.586562
10.06	0.480683
10.07	0.518525
10.08	0.567538
10.09	0.558079
10.10	0.776578
10.11	0.899528
10.12	1.071210
10.13	0.573457
10.14	0.819919
10.15	1.198410
10.16	1.708920
10.17	1.719630
10.18	1.896630
10.19	1.450820
10.20	1.702790
10.21	1.452670
10.22	1.496220
10.23	1.169040
10.24	1.242810
10.25	1.083520
10.26	1.110820
10.27	0.862245
10.28	1.025940
10.29	0.806265
10.30	0.818568
10.31	0.956511
10.32	1.043470
10.33	0.836235
10.34	0.721524
10.35	0.928078
10.36	1.115560
10.37	1.340680
10.38	1.399630
10.39	1.693360
10.40	1.546660
10.41	1.448110
10.42	1.863690
10.43	2.198540
10.44	1.762560
10.45	1.701360
10.46	1.460100
10.47	1.672420
10.48	1.543490
10.49	1.552980
10.50	1.260460
10.51	1.394420
10.52	1.443230
10.53	1.751100
10.54	1.266270
10.55	1.111960
10.56	0.959311
10.57	1.422820
10.58	1.299760
10.59	1.327670
10.60	1.019210
10.61	1.078050
10.62	1.169560
10.63	1.371460
10.64	1.123290
10.65	1.189500
10.66	1.162580
10.67	1.374340
10.68	1.410410
10.69	1.334710
10.70	0.803195
10.71	0.763825
10.72	0.710150
10.73	0.824485
10.74	0.685001
10.75	0.928340
10.76	0.690147
10.77	0.742336
10.78	1.110310
10.79	1.073180
10.80	0.957501
10.81	0.990397
10.82	1.204420
10.83	1.581040
10.84	1.529400
10.85	1.067100
10.86	1.297190
10.87	1.202480
10.88	0.964640
10.89	0.908647
10.90	1.145180
10.91	0.983243
10.92	0.994355
10.93	0.909966
10.94	0.601875
10.95	0.958480
10.96	0.630807
10.97	0.646052
10.98	0.696697
10.99	0.804519
11.00	0.673057
11.01	0.832800
11.02	0.914954
11.03	1.006820
11.04	1.139080
11.05	1.226270
11.06	1.658480
11.07	1.509710
11.08	1.296770
11.09	1.221320
11.10	1.553320
11.11	1.295500
11.12	1.396250
11.13	1.262900
11.14	1.589350
11.15	1.454280
11.16	1.681050
11.17	1.425990
11.18	1.341110
11.19	1.067380
11.20	0.799619
11.21	0.933695
11.22	1.039520
11.23	0.989601
11.24	1.239060
11.25	1.192650
11.26	1.108170
11.27	1.279800
11.28	1.130940
11.29	1.279500
11.30	1.433930
11.31	1.076970
11.32	1.068900
11.33	1.162170
11.34	1.066130
11.35	1.117960
11.36	1.014990
11.37	0.857871
11.38	0.908342
11.39	0.740461
11.40	0.876512
11.41	0.832229
11.42	1.121100
11.43	0.733734
11.44	0.755813
11.45	1.302860
11.46	1.363990
11.47	1.107290
11.48	0.857975
11.49	0.655352
11.50	1.159560
11.51	1.154940
11.52	1.231090
11.53	0.562051
11.54	0.681293
11.55	0.877977
11.56	1.058950
11.57	0.897324
11.58	0.875977
11.59	1.071600
11.60	0.757350
11.61	0.896057
11.62	0.962828
11.63	1.074300
11.64	1.040880
11.65	0.872704
11.66	0.910903
11.67	0.809727
11.68	0.825388
11.69	0.865656
11.70	0.756569
11.71	0.863106
11.72	0.803820
11.73	0.677280
11.74	0.878578
11.75	0.910578
11.76	0.741413
11.77	1.003400
11.78	0.891523
11.79	0.940167
11.80	1.419710
11.81	1.096060
11.82	0.972909
11.83	1.072250
11.84	1.356800
11.85	1.283480
11.86	1.530930
11.87	1.710950
11.88	1.596220
11.89	1.602050
11.90	1.863460
11.91	1.537680
11.92	1.542650
11.93	1.690000
11.94	1.184460
11.95	1.448940
11.96	1.893320
11.97	1.815470
11.98	1.272320
11.99	1.292200
12.00	1.255760
12.01	0.994425
12.02	1.194330
12.03	0.920274
12.04	0.826234
12.05	0.934855
12.06	0.734706
12.07	0.553928
12.08	0.568483
12.09	0.438661
12.10	0.635431
12.11	0.589038
12.12	0.677897
12.13	0.695719
12.14	0.813829
12.15	0.756462
12.16	0.747799
12.17	0.767640
12.18	1.016700
12.19	0.740665
12.20	0.774501
12.21	0.757793
12.22	0.683862
12.23	0.953826
12.24	1.103420
12.25	1.020560
12.26	0.894965
12.27	1.039640
12.28	0.771261
12.29	0.845103
12.30	0.636824
12.31	0.567330
12.32	0.918514
12.33	1.028920
12.34	0.607247
12.35	0.605801
12.36	0.677963
12.37	0.717534
12.38	0.711202
12.39	0.594062
12.40	0.702804
12.41	0.823278
12.42	0.906207
12.43	1.014160
12.44	0.950553
12.45	1.047890
12.46	1.101510
12.47	0.866034
12.48	1.306950
12.49	1.453170
12.50	1.330290
12.51	0.999713
12.52	1.027210
12.53	1.107250
12.54	1.031880
12.55	0.846508
12.56	0.875136
12.57	0.808617
12.58	0.842756
12.59	0.853582
12.60	0.774359
12.61	0.718913
12.62	0.580130
12.63	0.512069
12.64	0.467148
12.65	0.457386
12.66	0.440729
12.67	0.597810
12.68	0.779505
12.69	0.683796
12.70	0.669076
12.71	0.533538
12.72	0.716086
12.73	0.675769
12.74	0.447835
12.75	0.431089
12.76	0.556092
12.77	0.546446
12.78	0.689937
12.79	0.886188
12.80	0.962972
12.81	1.051600
12.82	0.874422
12.83	0.924715
12.84	0.799223
12.85	0.934332
12.86	1.321780
12.87	1.175760
12.88	1.178440
12.89	1.151510
12.90	1.074710
12.91	1.260430
12.92	1.258880
12.93	1.161790
12.94	1.470800
12.95	1.277240
12.96	1.051250
12.97	0.746866
12.98	0.937898
12.99	0.965930
13.00	0.886998
13.01	1.094080
13.02	1.128070
13.03	1.085480
13.04	1.039020
13.05	0.984676
13.06	1.154870
13.07	1.131180
13.08	1.197640
13.09	0.903737
13.10	1.089940
13.11	1.104510
13.12	1.178360
13.13	0.942904
13.14	1.440650
13.15	1.139260
13.16	1.097390
13.17	1.305860
13.18	1.207040
13.19	0.817895
13.20	0.806800
13.21	1.060870
13.22	1.582940
13.23	1.186700
13.24	1.729600
13.25	1.553120
13.26	1.278560
13.27	1.248380
13.28	1.105530
13.29	0.957542
13.30	0.923093
13.31	0.815787
13.32	0.788532
13.33	0.783897
13.34	0.942114
13.35	0.743112
13.36	0.743347
13.37	0.795715
13.38	0.920131
13.39	0.831446
13.40	0.947989
13.41	0.861699
13.42	0.818430
13.43	0.715479
13.44	0.796937
13.45	0.921686
13.46	0.692149
13.47	0.844552
13.48	0.871193
13.49	0.709481
13.50	0.644006
13.51	0.733734
13.52	0.693508
13.53	0.639234
13.54	0.646291
13.55	0.631678
13.56	0.843135
13.57	0.864349
13.58	1.092730
13.59	0.881949
13.60	0.864978
13.61	0.999300
13.62	0.938743
13.63	0.832550
13.64	0.707844
13.65	0.507448
13.66	0.319231
13.67	0.033440
13.68	0.055834
13.69	0.046665
13.70	0.026594
13.71	0.030369
13.72	0.058631
13.73	0.281101
13.74	0.333733
13.75	0.509829
13.76	0.606837
13.77	0.594410
13.78	0.557354
13.79	0.636354
13.80	0.681407
13.81	0.821339
13.82	1.027740
13.83	0.938780
13.84	1.002040
13.85	1.076910
13.86	1.067960
13.87	0.996027
13.88	1.048890
13.89	0.968874
13.90	0.794899
13.91	0.691306
13.92	0.677334
13.93	0.697674
13.94	0.774051
13.95	0.693884
13.96	0.783420
13.97	1.139450
13.98	1.020840
13.99	1.132820
14.00	1.005350
14.01	1.434150
14.02	0.922534
14.03	0.945884
14.04	1.048590
14.05	1.347800
14.06	0.987342
14.07	0.922216
14.08	0.772309
14.09	0.861231
14.10	0.807747
14.11	0.633415
14.12	0.617081
14.13	0.654977
14.14	0.810377
14.15	0.798997
14.16	0.608359
14.17	0.542490
14.18	0.505188
14.19	0.626135
14.20	0.521352
14.21	0.382672
14.22	0.502155
14.23	0.497350
14.24	0.484911
14.25	0.470244
14.26	0.333335
14.27	0.360148
14.28	0.397889
14.29	0.425648
14.30	0.555637
14.31	0.557539
14.32	0.848091
14.33	0.859630
14.34	0.539794
14.35	1.042920
14.36	0.842620
14.37	0.887603
14.38	0.677900
14.39	0.737858
14.40	0.637578
14.41	0.750123
14.42	1.061190
14.43	0.925276
14.44	1.160970
14.45	0.897755
14.46	0.978719
14.47	0.816625
14.48	0.863151
14.49	0.940173
14.50	0.844219
14.51	0.985759
14.52	0.803671
14.53	0.814668
14.54	0.854247
14.55	0.802827
14.56	0.635160
14.57	0.976422
14.58	0.880330
14.59	1.030640
14.60	0.895487
14.61	0.726460
14.62	0.747617
14.63	0.865075
14.64	0.814075
14.65	0.768147
14.66	0.854379
14.67	0.944198
14.68	0.946405
14.69	1.069290
14.70	0.914001
14.71	0.825073
14.72	0.877575
14.73	0.782828
14.74	0.639038
14.75	0.784691
14.76	0.943702
14.77	0.868351
14.78	0.928985
14.79	1.260480
14.80	1.103980
14.81	1.505320
14.82	1.685180
14.83	1.614050
14.84	1.186340
14.85	0.786870
14.86	0.958249
14.87	0.992222
14.88	1.084490
14.89	0.861374
14.90	0.996161
14.91	0.972629
14.92	0.926243
14.93	1.168530
14.94	1.256120
14.95	1.109070
14.96	0.916405
14.97	0.701090
14.98	0.793769
14.99	0.632672
15.00	0.816306
15.01	0.812846
15.02	0.819356
15.03	0.731667
15.04	0.792064
15.05	0.871855
15.06	0.934898
15.07	0.880506
15.08	1.023150
15.09	1.058050
15.10	0.935539
15.11	1.004840
15.12	0.777044
15.13	0.834139
15.14	0.805139
15.15	0.696988
15.16	0.509480
15.17	0.526257
15.18	0.403850
15.19	0.415850
15.20	0.442256
15.21	0.537868
15.22	0.734640
15.23	0.664741
15.24	0.843440
15.25	0.880945
15.26	1.119610
15.27	0.910482
15.28	0.717047
15.29	0.765934
15.30	0.960927
15.31	0.884715
15.32	0.753725
15.33	1.009890
15.34	0.935491
15.35	0.983543
15.36	0.945554
15.37	0.964656
15.38	0.872388
15.39	0.733655
15.40	0.717466
15.41	0.843536
15.42	0.749966
15.43	0.652701
15.44	0.531076
15.45	0.472036
15.46	0.469249
15.47	0.425846
15.48	0.397812
15.49	0.460083
15.50	0.484711
15.51	0.394324
15.52	0.500248
15.53	0.475312
15.54	0.487356
15.55	0.512348
15.56	0.391425
15.57	0.370822
15.58	0.491669
15.59	0.523973
15.60	0.476092
15.61	0.503784
15.62	0.475211
15.63	0.547220
15.64	0.551227
15.65	0.490095
15.66	0.377640
15.67	0.334504
15.68	0.357718
15.69	0.328750
15.70	0.288702
15.71	0.266905
15.72	0.284708
15.73	0.323166
15.74	0.416564
15.75	0.543905
15.76	0.708932
15.77	0.616611
15.78	0.707984
15.79	0.574839
15.80	0.592126
15.81	0.536796
15.82	0.672513
15.83	0.584971
15.84	0.570643
15.85	0.609330
15.86	0.621482
15.87	0.619329
15.88	0.868454
15.89	0.771289
15.90	0.607963
15.91	0.458508
15.92	0.347053
15.93	0.362114
15.94	0.320797
15.95	0.319111
15.96	0.493178
15.97	0.523914
15.98	0.544353
15.99	0.593240
16.00	0.721165
16.01	0.706718
16.02	0.572118
16.03	0.667798
16.04	0.610788
16.05	0.552189
16.06	0.722565
16.07	0.630077
16.08	0.527723
16.09	0.641873
16.10	0.540460
16.11	0.694753
16.12	0.809805
16.13	0.888978
16.14	0.984356
16.15	1.067730
16.16	0.851860
16.17	0.835372
16.18	0.717475
16.19	0.880422
16.20	0.933539
16.21	0.858096
16.22	0.703627
16.23	0.615908
16.24	0.670801
16.25	0.756831
16.26	0.630655
16.27	0.593060
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24.06	1.030840
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26.58	0.986475
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26.70	1.000110
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27.00	0.790079
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27.71	0.737178
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27.75	1.242320
27.76	1.173460
27.77	1.051680
27.78	0.875131
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27.82	0.469358
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27.86	0.611871
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27.88	0.680239
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27.90	0.749657
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27.92	0.901750
27.93	1.190910
27.94	1.283040
27.95	1.439890
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27.97	1.496050
27.98	1.609970
27.99	1.469720
28.00	1.652370
28.01	1.719020
28.02	1.555590
28.03	1.521940
28.04	1.132310
28.05	1.110990
28.06	1.414510
28.07	1.336850
28.08	1.516640
28.09	1.422030
28.10	1.591220
28.11	1.596270
28.12	1.532300
28.13	1.492070
28.14	1.611400
28.15	1.929560
28.16	2.281840
28.17	2.993520
28.18	2.639320
28.19	2.580950
28.20	1.952890
28.21	1.416820
28.22	0.886727
28.23	0.889489
28.24	0.859628
28.25	1.066060
28.26	1.119730
28.27	1.121500
28.28	1.070770
28.29	0.903027
28.30	0.974521
28.31	0.934947
28.32	0.862150
28.33	0.923576
28.34	0.899843
28.35	0.959739
28.36	1.092770
28.37	1.020730
28.38	1.029740
28.39	1.123770
28.40	1.066370
28.41	0.960121
28.42	0.986897
28.43	0.810706
28.44	0.876555
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28.47	0.813871
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28.50	0.696585
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28.53	0.786065
28.54	0.688255
28.55	0.670756
28.56	0.699798
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28.58	0.534463
28.59	0.487291
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28.61	0.548144
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28.64	0.658727
28.65	0.641343
28.66	0.629214
28.67	0.736814
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28.69	0.716188
28.70	0.802347
28.71	0.688026
28.72	0.707369
28.73	0.709684
28.74	0.666589
28.75	0.863742
28.76	0.701498
28.77	0.732355
28.78	0.580953
28.79	0.610616
28.80	0.588909
28.81	0.509047
28.82	0.551125
28.83	0.562655
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28.85	0.293758
28.86	0.292675
28.87	0.528554
28.88	0.664400
28.89	0.756591
28.90	0.681494
28.91	0.577684
28.92	0.549744
28.93	0.531658
28.94	0.732318
28.95	0.706259
28.96	0.803872
28.97	0.806502
28.98	0.765183
28.99	0.683571
29.00	0.598352
29.01	0.714548
29.02	0.682844
29.03	0.621164
29.04	0.544705
29.05	0.534899
29.06	0.298106
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29.08	0.040095
29.09	0.036718
29.10	0.062055
29.11	0.346785
29.12	0.558344
29.13	0.428713
29.14	0.421448
29.15	0.323542
29.16	0.713966
29.17	0.950443
29.18	1.021490
29.19	0.956157
29.20	1.052650
29.21	1.468020
29.22	1.082750
29.23	0.906667
29.24	0.401699
29.25	0.342391
29.26	0.768717
29.27	0.907791
29.28	0.937983
29.29	1.087830
29.30	0.812429
29.31	0.770447
29.32	0.840244
29.33	0.819429
29.34	0.979874
29.35	0.825297
29.36	0.784602
29.37	0.858828
29.38	0.740877
29.39	0.764135
29.40	0.833949
29.41	1.051190
29.42	1.032860
29.43	1.058110
29.44	0.965378
29.45	1.088950
29.46	1.157160
29.47	1.258810
29.48	1.219410
29.49	1.185960
29.50	0.985066
29.51	1.086870
29.52	0.788811
29.53	0.965778
29.54	0.893585
29.55	0.464475
29.56	0.774922
29.57	1.144800
29.58	0.862132
29.59	0.827589
29.60	0.935015
29.61	0.894986
29.62	0.873615
29.63	0.800900
29.64	0.861276
29.65	0.849702
29.66	0.711191
29.67	0.408084
29.68	0.411988
29.69	0.413624
29.70	0.407691
29.71	0.537075
29.72	0.538356
29.73	0.659425
29.74	0.785189
29.75	0.809478
29.76	0.886974
29.77	0.874206
29.78	0.687015
29.79	0.668466
29.80	0.568439
29.81	0.577145
29.82	0.563507
29.83	0.522499

Only the first 2000 rows were shown. To view the complete dataset, download it as tab-delimited text. You can still view the full matrix in your browser, but be aware that this may crash the browser due to the huge size.