Citation:

PANGAEA.926850

Name: Sulfur hexafluoride (SF6) traces of Moulin L41A on the Greenland Ice Sheet measured in summer 2012
Published: 2021-01-21
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Greenland; hydrology; Ice Sheet; moulin; subglacial; tracing

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Abstract:

SF6 gas traces were injected into Moulin L41A, and samples were collected in the proglacial river near Leverett Glacier terminus (67.09N, -50.23E). A total of 11 traces were carried out between 16 June and 6 August, 2012. Tracers were injected at ~19:00 hrs, shortly after the peak daily moulin discharge (typically between 15:00 and 19:00 hrs). Tracer concentrations were monitored by collecting water samples from the proglacial river draining Leverett Glacier and were analysed by a Cambridge Scientific 300-series gas chromatograph fitted with an electron capture detector. Analytical errors (estimated from the analysis of duplicate samples) were below 15% and the level of detection of SF6 was below 0.005 parts per trillion by mass in water. The analytical method was more sensitive than that employed in our previous study at this site (Chandler et al., 2013, http://dx.doi.org/10.1038/ngeo1737) and is described in detail by Chandler et el. (In review, Earth and Planetary Science Letters)

Keyword(s):

Greenland; hydrology; Ice Sheet; moulin; subglacial; tracing

Related to:

Chandler, David M; Wadham, Jemma; Nienow, P W; Doyle, Samuel H; Tedstone, Andrew; Telling, Jon; Hawkings, Jonathan; Alcock, Jonathan; Linhoff, Benjamin; Hubbard, Alun L (2021): Rapid development and persistence of efficient subglacial drainage under 900 m-thick ice in Greenland. Earth and Planetary Science Letters, 566, 116982, https://doi.org/10.1016/j.epsl.2021.116982

Chandler, David M; Wadham, Jemma; Nienow, Peter; Doyle, Samuel H; Tedstone, Andrew; Telling, Jon; Hawkings, Jonathan; Alcock, Jonathan; Linhoff, Benjamin; Hubbard, Alun L (2021): Ice ablation record from the Greenland Ice Sheet measured in spring/summer 2012. PANGAEA, https://doi.org/10.1594/PANGAEA.926842

Chandler, David M; Wadham, Jemma; Nienow, Peter; Doyle, Samuel H; Tedstone, Andrew; Telling, Jon; Hawkings, Jonathan; Alcock, Jonathan; Linhoff, Benjamin; Hubbard, Alun L (2021): Proglacial river discharge from the Greenland Ice Sheet measured in spring/summer 2012. PANGAEA, https://doi.org/10.1594/PANGAEA.926841

Chandler, David M; Wadham, Jemma; Nienow, Peter; Doyle, Samuel H; Tedstone, Andrew; Telling, Jon; Hawkings, Jonathan; Alcock, Jonathan; Linhoff, Benjamin; Hubbard, Alun L (2021): Supraglacial river discharge into Moulin L41A on the Greenland Ice Sheet measured in spring/summer 2012. PANGAEA, https://doi.org/10.1594/PANGAEA.926844

Chandler, David M; Wadham, Jemma; Nienow, Peter; Doyle, Samuel H; Tedstone, Andrew; Telling, Jon; Hawkings, Jonathan; Alcock, Jonathan; Linhoff, Benjamin; Hubbard, Alun L (2021): Westwards component of ice surface velocity on the Greenland Ice Sheet measured in spring/summer 2012. PANGAEA, https://doi.org/10.1594/PANGAEA.926843

Coverage:

Latitude: 66.970000 * Longitude: -49.270000

Date/Time Start: 2012-06-16T18:00:00 * Date/Time End: 2012-08-06T19:10:00

Event(s):

Moulin_L41A * Latitude: 66.970000 * Longitude: -49.270000 * Location: Greenland ice sheet * Method/Device: Ice observation (ICEOBS) * Comment: Observation duration: spring/summer 2012

Comment:

Tracer injection times are local time (UTC-3). Times after injection are the time in hours after the gas was released into the moulin. SF6 concentration is the concentration in the proglacial river, reported as parts per trillion by mass in water, and is usually the mean of duplicate samples.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Identification	ID		Chandler, David M		Trace ID
2	DATE/TIME	Date/Time		Chandler, David M		Geocode – UTC-3
3	Time in hours	Time	h	Chandler, David M		Time after injection
4	Sulfur hexafluoride, SF6	SF6	ng/kg	Chandler, David M	Gas chromatograph with an electron capture detector (GC-ECD)	Original unit: ppt

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Size:

1137 data points

Data

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

1 ID	2 Date/Time	3 Time [h]	4 SF6 [ng/kg]
Trace #01	2012-06-16T18:00	0	0.000000000
Trace #01	2012-06-16T18:00	3	0.000000000
Trace #01	2012-06-16T18:00	9	0.000000000
Trace #01	2012-06-16T18:00	15	0.000000000
Trace #01	2012-06-16T18:00	18	0.000000000
Trace #01	2012-06-16T18:00	24	0.000000000
Trace #01	2012-06-16T18:00	30	0.058207335
Trace #01	2012-06-16T18:00	36	0.139937513
Trace #01	2012-06-16T18:00	39	0.344354893
Trace #01	2012-06-16T18:00	42	1.061001660
Trace #01	2012-06-16T18:00	48	2.043005086
Trace #01	2012-06-16T18:00	51	2.081905126
Trace #01	2012-06-16T18:00	54	1.811617397
Trace #01	2012-06-16T18:00	57	1.865964814
Trace #01	2012-06-16T18:00	60	1.653325463
Trace #01	2012-06-16T18:00	63	1.446386625
Trace #01	2012-06-16T18:00	66	1.347993131
Trace #01	2012-06-16T18:00	69	1.135511062
Trace #01	2012-06-16T18:00	72	0.968340241
Trace #01	2012-06-16T18:00	81	0.626203435
Trace #01	2012-06-16T18:00	84	0.614072011
Trace #01	2012-06-16T18:00	90	0.708194218
Trace #01	2012-06-16T18:00	99	0.302469080
Trace #01	2012-06-16T18:00	102	0.249713415
Trace #01	2012-06-16T18:00	105	0.213899473
Trace #01	2012-06-16T18:00	111	0.161994082
Trace #01	2012-06-16T18:00	114	0.149598330
Trace #01	2012-06-16T18:00	117	0.129168976
Trace #01	2012-06-16T18:00	126	0.084209378
Trace #01	2012-06-16T18:00	129	0.072416103
Trace #01	2012-06-16T18:00	144	0.042204474
Trace #01	2012-06-16T18:00	147	0.045427594
Trace #01	2012-06-16T18:00	150	0.020021909
Trace #01	2012-06-16T18:00	153	0.036617682
Trace #01	2012-06-16T18:00	156	0.030216146
Trace #01	2012-06-16T18:00	159	0.033035656
Trace #01	2012-06-16T18:00	165	0.031987344
Trace #01	2012-06-16T18:00	168	0.033607434
Trace #01	2012-06-16T18:00	170	0.028551374
Trace #01	2012-06-16T18:00	172	0.021955615
Trace #02	2012-06-23T18:00	0	0.033607434
Trace #02	2012-06-23T18:00	2	0.028551374
Trace #02	2012-06-23T18:00	4	0.021955615
Trace #02	2012-06-23T18:00	10	0.028946966
Trace #02	2012-06-23T18:00	12	0.020851638
Trace #02	2012-06-23T18:00	14	0.017835403
Trace #02	2012-06-23T18:00	16	0.025472254
Trace #02	2012-06-23T18:00	18	2.058082470
Trace #02	2012-06-23T18:00	19	3.911325894
Trace #02	2012-06-23T18:00	21	6.291294954
Trace #02	2012-06-23T18:00	22	6.501476695
Trace #02	2012-06-23T18:00	24	5.738779171
Trace #02	2012-06-23T18:00	26	4.169082307
Trace #02	2012-06-23T18:00	28	4.000787465
Trace #02	2012-06-23T18:00	30	3.566200057
Trace #02	2012-06-23T18:00	32	2.750416180
Trace #02	2012-06-23T18:00	36	2.068520457
Trace #02	2012-06-23T18:00	38	1.485727484
Trace #02	2012-06-23T18:00	40	1.299409929
Trace #02	2012-06-23T18:00	42	1.141900868
Trace #02	2012-06-23T18:00	44	0.868351874
Trace #02	2012-06-23T18:00	48	0.667804932
Trace #02	2012-06-23T18:00	50	0.642441775
Trace #02	2012-06-23T18:00	52	0.577916234
Trace #02	2012-06-23T18:00	60	0.443374009
Trace #02	2012-06-23T18:00	62	0.385507457
Trace #02	2012-06-23T18:00	64	0.362296882
Trace #02	2012-06-23T18:00	66	0.302814234
Trace #02	2012-06-23T18:00	68	0.320101070
Trace #02	2012-06-23T18:00	70	0.200777176
Trace #02	2012-06-23T18:00	72	0.182401346
Trace #02	2012-06-23T18:00	76	0.155819519
Trace #02	2012-06-23T18:00	78	0.158814500
Trace #02	2012-06-23T18:00	80	0.136572620
Trace #02	2012-06-23T18:00	84	0.121842469
Trace #02	2012-06-23T18:00	86	0.123720559
Trace #02	2012-06-23T18:00	87	0.066923718
Trace #02	2012-06-23T18:00	88	0.094469612
Trace #02	2012-06-23T18:00	90	0.085413592
Trace #02	2012-06-23T18:00	92	0.078644808
Trace #02	2012-06-23T18:00	94	0.037415017
Trace #02	2012-06-23T18:00	120	0.014611257
Trace #02	2012-06-23T18:00	122	0.015057576
Trace #02	2012-06-23T18:00	124	0.014073300
Trace #03	2012-06-28T18:00	0	0.014611257
Trace #03	2012-06-28T18:00	2	0.015057576
Trace #03	2012-06-28T18:00	4	0.014073300
Trace #03	2012-06-28T18:00	6	0.013646919
Trace #03	2012-06-28T18:00	8	0.013879813
Trace #03	2012-06-28T18:00	10	0.012909663
Trace #03	2012-06-28T18:00	14	0.360855472
Trace #03	2012-06-28T18:00	16	0.951056664
Trace #03	2012-06-28T18:00	20	0.312384037
Trace #03	2012-06-28T18:00	21	0.256727986
Trace #03	2012-06-28T18:00	22	0.191336408
Trace #03	2012-06-28T18:00	25	0.138693059
Trace #03	2012-06-28T18:00	27	0.121924154
Trace #03	2012-06-28T18:00	28	0.098690506
Trace #03	2012-06-28T18:00	30	0.095783775
Trace #03	2012-06-28T18:00	32	0.071289464
Trace #03	2012-06-28T18:00	34	0.069862687
Trace #03	2012-06-28T18:00	36	0.057616507
Trace #03	2012-06-28T18:00	38	0.050978031
Trace #03	2012-06-28T18:00	40	0.044476788
Trace #03	2012-06-28T18:00	42	0.042539285
Trace #03	2012-06-28T18:00	44	0.035220774
Trace #03	2012-06-28T18:00	46	0.031585945
Trace #03	2012-06-28T18:00	48	0.028014970
Trace #03	2012-06-28T18:00	50	0.024376486
Trace #03	2012-06-28T18:00	52	0.021399276
Trace #03	2012-06-28T18:00	54	0.020781509
Trace #03	2012-06-28T18:00	56	0.021085369
Trace #03	2012-06-28T18:00	58	0.018749556
Trace #03	2012-06-28T18:00	60	0.016777271
Trace #03	2012-06-28T18:00	62	0.016256061
Trace #03	2012-06-28T18:00	64	0.014632271
Trace #03	2012-06-28T18:00	66	0.012659787
Trace #03	2012-06-28T18:00	68	0.011453195
Trace #03	2012-06-28T18:00	72	0.022449793
Trace #03	2012-06-28T18:00	96	0.015690488
Trace #03	2012-06-28T18:00	98	0.015506143
Trace #04	2012-07-02T19:05	0	0.015690488
Trace #04	2012-07-02T19:05	1	0.015506143
Trace #04	2012-07-02T19:05	3	0.012105567
Trace #04	2012-07-02T19:05	5	0.013888430
Trace #04	2012-07-02T19:05	7	0.009802369
Trace #04	2012-07-02T19:05	9	0.008964255
Trace #04	2012-07-02T19:05	10	0.010375766
Trace #04	2012-07-02T19:05	11	0.010268921
Trace #04	2012-07-02T19:05	11	0.025663975
Trace #04	2012-07-02T19:05	12	0.202421239
Trace #04	2012-07-02T19:05	13	0.496067730
Trace #04	2012-07-02T19:05	14	0.800279600
Trace #04	2012-07-02T19:05	14	0.812432247
Trace #04	2012-07-02T19:05	15	1.266556877
Trace #04	2012-07-02T19:05	16	0.964168813
Trace #04	2012-07-02T19:05	16	0.995348126
Trace #04	2012-07-02T19:05	17	0.920349529
Trace #04	2012-07-02T19:05	17	0.794780450
Trace #04	2012-07-02T19:05	19	0.515954649
Trace #04	2012-07-02T19:05	19	0.466051154
Trace #04	2012-07-02T19:05	20	0.386884964
Trace #04	2012-07-02T19:05	20	0.295952005
Trace #04	2012-07-02T19:05	23	0.162186891
Trace #04	2012-07-02T19:05	27	0.071658925
Trace #04	2012-07-02T19:05	29	0.059896752
Trace #04	2012-07-02T19:05	34	0.034954785
Trace #04	2012-07-02T19:05	37	0.035579956
Trace #04	2012-07-02T19:05	39	0.034095637
Trace #04	2012-07-02T19:05	41	0.033737609
Trace #04	2012-07-02T19:05	43	0.027694103
Trace #04	2012-07-02T19:05	45	0.027558167
Trace #05	2012-07-06T19:10	0	0.007056791
Trace #05	2012-07-06T19:10	3	0.007393500
Trace #05	2012-07-06T19:10	5	0.006413948
Trace #05	2012-07-06T19:10	8	0.007065736
Trace #05	2012-07-06T19:10	11	0.010523934
Trace #05	2012-07-06T19:10	11	0.185745637
Trace #05	2012-07-06T19:10	12	0.393625708
Trace #05	2012-07-06T19:10	12	0.561659506
Trace #05	2012-07-06T19:10	13	0.667828876
Trace #05	2012-07-06T19:10	14	0.673162803
Trace #05	2012-07-06T19:10	14	0.501042101
Trace #05	2012-07-06T19:10	15	0.484003026
Trace #05	2012-07-06T19:10	15	0.397058741
Trace #05	2012-07-06T19:10	16	0.322138035
Trace #05	2012-07-06T19:10	16	0.277687050
Trace #05	2012-07-06T19:10	17	0.209835006
Trace #05	2012-07-06T19:10	17	0.162801788
Trace #05	2012-07-06T19:10	18	0.139160185
Trace #05	2012-07-06T19:10	19	0.097758956
Trace #05	2012-07-06T19:10	20	0.104204292
Trace #05	2012-07-06T19:10	21	0.040940023
Trace #05	2012-07-06T19:10	22	0.028325657
Trace #05	2012-07-06T19:10	23	0.024846789
Trace #05	2012-07-06T19:10	24	0.009562435
Trace #05	2012-07-06T19:10	26	0.014236356
Trace #05	2012-07-06T19:10	29	0.010780779
Trace #05	2012-07-06T19:10	32	0.003917100
Trace #05	2012-07-06T19:10	35	0.002207437
Trace #05	2012-07-06T19:10	38	0.003813358
Trace #06	2012-07-10T19:10	0	0.012500884
Trace #06	2012-07-10T19:10	2	0.005508254
Trace #06	2012-07-10T19:10	5	0.005321841
Trace #06	2012-07-10T19:10	8	0.007614849
Trace #06	2012-07-10T19:10	10	0.235985281
Trace #06	2012-07-10T19:10	10	0.451575569
Trace #06	2012-07-10T19:10	11	0.662454964
Trace #06	2012-07-10T19:10	11	0.776276229
Trace #06	2012-07-10T19:10	12	0.494770195
Trace #06	2012-07-10T19:10	13	0.361922605
Trace #06	2012-07-10T19:10	13	0.290443183
Trace #06	2012-07-10T19:10	14	0.196648301
Trace #06	2012-07-10T19:10	14	0.163844500
Trace #06	2012-07-10T19:10	15	0.139572292
Trace #06	2012-07-10T19:10	15	0.119183755
Trace #06	2012-07-10T19:10	16	0.081934996
Trace #06	2012-07-10T19:10	17	0.069065988
Trace #06	2012-07-10T19:10	19	0.041123682
Trace #06	2012-07-10T19:10	22	0.028023116
Trace #06	2012-07-10T19:10	23	0.024018341
Trace #06	2012-07-10T19:10	23	0.052402525
Trace #06	2012-07-10T19:10	26	0.016725216
Trace #06	2012-07-10T19:10	29	0.014933997
Trace #06	2012-07-10T19:10	32	0.012347732
Trace #06	2012-07-10T19:10	35	0.012510881
Trace #06	2012-07-10T19:10	38	0.010135979
Trace #06	2012-07-10T19:10	41	0.009890465
Trace #07	2012-07-16T19:05	0	0.004449712
Trace #07	2012-07-16T19:05	5	0.002456272
Trace #07	2012-07-16T19:05	8	0.004414659
Trace #07	2012-07-16T19:05	11	1.263582285
Trace #07	2012-07-16T19:05	11	1.771855210
Trace #07	2012-07-16T19:05	12	1.937855652
Trace #07	2012-07-16T19:05	12	2.216106599
Trace #07	2012-07-16T19:05	13	1.911595416
Trace #07	2012-07-16T19:05	13	1.573998687
Trace #07	2012-07-16T19:05	14	1.137379776
Trace #07	2012-07-16T19:05	14	0.870989954
Trace #07	2012-07-16T19:05	15	0.690336136
Trace #07	2012-07-16T19:05	15	0.552712984
Trace #07	2012-07-16T19:05	16	0.494914602
Trace #07	2012-07-16T19:05	16	0.365353384
Trace #07	2012-07-16T19:05	17	0.298899533
Trace #07	2012-07-16T19:05	17	0.256361789
Trace #07	2012-07-16T19:05	18	0.206995208
Trace #07	2012-07-16T19:05	19	0.145549863
Trace #07	2012-07-16T19:05	20	0.120824686
Trace #07	2012-07-16T19:05	20	0.125766848
Trace #07	2012-07-16T19:05	21	0.103496416
Trace #07	2012-07-16T19:05	22	0.079411349
Trace #07	2012-07-16T19:05	23	0.098417138
Trace #07	2012-07-16T19:05	26	0.190772179
Trace #07	2012-07-16T19:05	29	0.033777514
Trace #07	2012-07-16T19:05	32	0.011231350
Trace #07	2012-07-16T19:05	35	0.008863415
Trace #07	2012-07-16T19:05	38	0.009117889
Trace #07	2012-07-16T19:05	41	0.009598071
Trace #07	2012-07-16T19:05	44	0.006686777
Trace #07	2012-07-16T19:05	47	0.004937767
Trace #07	2012-07-16T19:05	59	0.004172782
Trace #08	2012-07-23T19:15	0	0.002365694
Trace #08	2012-07-23T19:15	2	0.003197126
Trace #08	2012-07-23T19:15	10	0.003780441
Trace #08	2012-07-23T19:15	11	0.005138957
Trace #08	2012-07-23T19:15	12	0.078415820
Trace #08	2012-07-23T19:15	12	0.438411088
Trace #08	2012-07-23T19:15	13	0.425437651
Trace #08	2012-07-23T19:15	13	0.697181488
Trace #08	2012-07-23T19:15	14	0.719083261
Trace #08	2012-07-23T19:15	14	0.671655027
Trace #08	2012-07-23T19:15	15	0.592693127
Trace #08	2012-07-23T19:15	15	0.465246957
Trace #08	2012-07-23T19:15	16	0.354797607
Trace #08	2012-07-23T19:15	16	0.252382830
Trace #08	2012-07-23T19:15	17	0.198738559
Trace #08	2012-07-23T19:15	17	0.148567735
Trace #08	2012-07-23T19:15	18	0.113689312
Trace #08	2012-07-23T19:15	19	0.073017734
Trace #08	2012-07-23T19:15	20	0.043367611
Trace #08	2012-07-23T19:15	21	0.032838725
Trace #08	2012-07-23T19:15	22	0.023556705
Trace #08	2012-07-23T19:15	23	0.021382910
Trace #08	2012-07-23T19:15	26	0.020312642
Trace #08	2012-07-23T19:15	29	0.010369020
Trace #08	2012-07-23T19:15	32	0.006207121
Trace #08	2012-07-23T19:15	35	0.005479708
Trace #08	2012-07-23T19:15	38	0.004085572
Trace #08	2012-07-23T19:15	41	0.005811234
Trace #08	2012-07-23T19:15	44	0.005374474
Trace #08	2012-07-23T19:15	46	0.004572854
Trace #08	2012-07-23T19:15	47	0.006116321
Trace #08	2012-07-23T19:15	50	0.006381759
Trace #08	2012-07-23T19:15	63	0.003318451
Trace #09	2012-07-28T19:25	0	0.004823366
Trace #09	2012-07-28T19:25	2	0.004387802
Trace #09	2012-07-28T19:25	5	0.004178029
Trace #09	2012-07-28T19:25	8	0.003838079
Trace #09	2012-07-28T19:25	10	0.004093430
Trace #09	2012-07-28T19:25	10	0.006890728
Trace #09	2012-07-28T19:25	11	0.005302498
Trace #09	2012-07-28T19:25	11	0.003653846
Trace #09	2012-07-28T19:25	12	0.004243119
Trace #09	2012-07-28T19:25	12	0.007255870
Trace #09	2012-07-28T19:25	13	0.045852934
Trace #09	2012-07-28T19:25	13	0.086273423
Trace #09	2012-07-28T19:25	14	0.161372810
Trace #09	2012-07-28T19:25	14	0.266556148
Trace #09	2012-07-28T19:25	15	0.517099991
Trace #09	2012-07-28T19:25	15	0.297653435
Trace #09	2012-07-28T19:25	16	0.264054909
Trace #09	2012-07-28T19:25	16	0.277637069
Trace #09	2012-07-28T19:25	17	0.194743825
Trace #09	2012-07-28T19:25	17	0.138001626
Trace #09	2012-07-28T19:25	18	0.111716576
Trace #09	2012-07-28T19:25	19	0.079159732
Trace #09	2012-07-28T19:25	20	0.053052980
Trace #09	2012-07-28T19:25	21	0.046755338
Trace #09	2012-07-28T19:25	22	0.027365912
Trace #09	2012-07-28T19:25	23	0.022766888
Trace #09	2012-07-28T19:25	26	0.021155307
Trace #09	2012-07-28T19:25	29	0.009917645
Trace #09	2012-07-28T19:25	32	0.007847523
Trace #09	2012-07-28T19:25	35	0.006488328
Trace #09	2012-07-28T19:25	38	0.005051299
Trace #09	2012-07-28T19:25	41	0.004295616
Trace #09	2012-07-28T19:25	44	0.004299938
Trace #09	2012-07-28T19:25	46	0.004633658
Trace #09	2012-07-28T19:25	47	0.004051942
Trace #10	2012-08-03T19:15	0	0.003223131
Trace #10	2012-08-03T19:15	2	0.002544315
Trace #10	2012-08-03T19:15	5	0.002462385
Trace #10	2012-08-03T19:15	8	0.002702054
Trace #10	2012-08-03T19:15	9	0.005791197
Trace #10	2012-08-03T19:15	10	0.061620203
Trace #10	2012-08-03T19:15	10	0.492868015
Trace #10	2012-08-03T19:15	11	1.169484535
Trace #10	2012-08-03T19:15	11	1.059430419
Trace #10	2012-08-03T19:15	12	0.563755802
Trace #10	2012-08-03T19:15	12	0.279711429
Trace #10	2012-08-03T19:15	13	0.140957242
Trace #10	2012-08-03T19:15	13	0.071150320
Trace #10	2012-08-03T19:15	14	0.040992101
Trace #10	2012-08-03T19:15	14	0.030134836
Trace #10	2012-08-03T19:15	15	0.020514035
Trace #10	2012-08-03T19:15	15	0.015770616
Trace #10	2012-08-03T19:15	16	0.013914563
Trace #10	2012-08-03T19:15	16	0.011874929
Trace #10	2012-08-03T19:15	17	0.011041752
Trace #10	2012-08-03T19:15	17	0.008067544
Trace #10	2012-08-03T19:15	18	0.006977309
Trace #10	2012-08-03T19:15	19	0.005900696
Trace #10	2012-08-03T19:15	20	0.004416953
Trace #10	2012-08-03T19:15	21	0.004103672
Trace #10	2012-08-03T19:15	22	0.003476454
Trace #10	2012-08-03T19:15	23	0.003180915
Trace #10	2012-08-03T19:15	26	0.002997535
Trace #10	2012-08-03T19:15	29	0.002622085
Trace #10	2012-08-03T19:15	32	0.002619284
Trace #10	2012-08-03T19:15	35	0.002745287
Trace #10	2012-08-03T19:15	38	0.002858703
Trace #10	2012-08-03T19:15	41	0.002824352
Trace #10	2012-08-03T19:15	44	0.002930860
Trace #10	2012-08-03T19:15	47	0.002367822
Trace #11	2012-08-06T19:10	0	0.002532952
Trace #11	2012-08-06T19:10	2	0.002037395
Trace #11	2012-08-06T19:10	5	0.002249714
Trace #11	2012-08-06T19:10	8	0.002184705
Trace #11	2012-08-06T19:10	10	0.003172368
Trace #11	2012-08-06T19:10	10	0.003013559
Trace #11	2012-08-06T19:10	11	0.003040904
Trace #11	2012-08-06T19:10	11	0.003262841
Trace #11	2012-08-06T19:10	12	0.013257267
Trace #11	2012-08-06T19:10	12	0.076114390
Trace #11	2012-08-06T19:10	13	0.291217767
Trace #11	2012-08-06T19:10	13	0.585133995
Trace #11	2012-08-06T19:10	14	0.969587652
Trace #11	2012-08-06T19:10	14	1.159482360
Trace #11	2012-08-06T19:10	15	1.102649841
Trace #11	2012-08-06T19:10	15	0.993303108
Trace #11	2012-08-06T19:10	16	0.749486671
Trace #11	2012-08-06T19:10	16	0.475879504
Trace #11	2012-08-06T19:10	17	0.326190514
Trace #11	2012-08-06T19:10	17	0.203498275
Trace #11	2012-08-06T19:10	18	0.119307989
Trace #11	2012-08-06T19:10	19	0.055244372
Trace #11	2012-08-06T19:10	20	0.033122822
Trace #11	2012-08-06T19:10	21	0.017955915
Trace #11	2012-08-06T19:10	22	0.011402124
Trace #11	2012-08-06T19:10	23	0.008246269
Trace #11	2012-08-06T19:10	26	0.004892942
Trace #11	2012-08-06T19:10	29	0.003764772
Trace #11	2012-08-06T19:10	32	0.003458833
Trace #11	2012-08-06T19:10	35	0.003693765
Trace #11	2012-08-06T19:10	38	0.003520857
Trace #11	2012-08-06T19:10	41	0.003505103
Trace #11	2012-08-06T19:10	44	0.003428064
Trace #11	2012-08-06T19:10	47	0.003692477
Trace #11	2012-08-06T19:10	50	0.003896505