Metocean: Historical collections
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Brought to you by NOAA NMFS SWFSC ERD |
Dataset Title: | "Deepwater CTD - 00085.ctd.nc - 28.0N, -86.0W - 1994-05-03" |
Institution: | Texas A&M University, Department of Oceanography (Dataset ID: deepwater_00085_ctd) |
Information: | Summary | License | FGDC | ISO 19115 | Metadata | Background | Data Access Form | Files | Make a graph |
To view the map, check View : Map of All Related Data above.
WARNING: This may involve lots of data.
For some datasets, this may be slow.
Consider using this only when you need it and
have selected a small subset of the data.
To view the counts of distinct combinations of the variables listed above,
check View : Distinct Data Counts above and select a value for one of the variables above.
Distinct Data (Metadata) (Refine the data subset and/or download the data)
depth | temperature | salinity | oxygen | pressure | nitrite | nitrate | phosphate | silicate | salinity2 | qualityFlag |
---|---|---|---|---|---|---|---|---|---|---|
m | degree_C | PSU | milligrams per liter | decibars | not-measured | not-measured | not-measured | not-measured | PSU | |
1.0 | 25.291000366210938 | 10.321000099182129 | 1.0069999694824219 | -99.0 | -99.0 | -99.0 | -99.0 | -99.0 | 0.0 | |
2.0 | 25.29360008239746 | 7.370999813079834 | 2.013000011444092 | -99.0 | -99.0 | -99.0 | -99.0 | -99.0 | 0.0 | |
3.0 | 25.29509925842285 | 7.060999870300293 | 3.0199999809265137 | -99.0 | -99.0 | -99.0 | -99.0 | -99.0 | 0.0 | |
4.0 | 25.297100067138672 | 7.385000228881836 | 4.0269999504089355 | -99.0 | -99.0 | -99.0 | -99.0 | -99.0 | 0.0 | |
5.0 | 25.300800323486328 | 8.07800006866455 | 5.033999919891357 | -99.0 | -99.0 | -99.0 | -99.0 | -99.0 | 0.0 | |
6.0 | 25.302900314331055 | 8.437999725341797 | 6.039999961853027 | -99.0 | -99.0 | -99.0 | -99.0 | -99.0 | 0.0 | |
7.0 | 25.301599502563477 | 8.618000030517578 | 7.046999931335449 | -99.0 | -99.0 | -99.0 | -99.0 | -99.0 | 0.0 | |
8.0 | 25.304000854492188 | 8.906999588012695 | 8.053999900817871 | -99.0 | -99.0 | -99.0 | -99.0 | -99.0 | 0.0 | |
9.0 | 25.303199768066406 | 8.87399959564209 | 9.0600004196167 | -99.0 | -99.0 | -99.0 | -99.0 | -99.0 | 0.0 | |
10.0 | 25.30229949951172 | 8.668999671936035 | 10.067000389099121 | -99.0 | -99.0 | -99.0 | -99.0 | -99.0 | 0.0 | |
11.0 | 25.303199768066406 | 8.680999755859375 | 11.074000358581543 | -99.0 | -99.0 | -99.0 | -99.0 | -99.0 | 0.0 | |
12.0 | 25.300100326538086 | 8.927000045776367 | 12.081000328063965 | -99.0 | -99.0 | -99.0 | -99.0 | -99.0 | 0.0 | |
13.0 | 25.295299530029297 | 9.678999900817871 | 13.086999893188477 | 0.0 | ||||||
14.0 | 25.289499282836914 | 9.737000465393066 | 14.093999862670898 | 0.0 | ||||||
15.0 | 25.28689956665039 | 9.883999824523926 | 15.10099983215332 | 0.0 | ||||||
16.0 | 25.268800735473633 | 10.116000175476074 | 16.107999801635742 | 0.0 | ||||||
17.0 | 25.226499557495117 | 10.27400016784668 | 17.114999771118164 | 0.0 | ||||||
18.0 | 25.194900512695312 | 10.468999862670898 | 18.121000289916992 | 0.0 | ||||||
19.0 | 25.191999435424805 | 10.590999603271484 | 19.128000259399414 | 0.0 | ||||||
20.0 | 25.159000396728516 | 10.722000122070312 | 20.135000228881836 | 0.0 | ||||||
21.0 | 25.133699417114258 | 10.861000061035156 | 21.142000198364258 | 0.0 | ||||||
22.0 | 25.127300262451172 | 11.008000373840332 | 22.148000717163086 | 0.0 | ||||||
23.0 | 25.122100830078125 | 11.164999961853027 | 23.155000686645508 | 0.0 | ||||||
24.0 | 25.11520004272461 | 11.29699993133545 | 24.16200065612793 | 0.0 | ||||||
25.0 | 25.023300170898438 | 11.416999816894531 | 25.16900062561035 | 0.0 | ||||||
26.0 | 24.667800903320312 | 11.569000244140625 | 26.176000595092773 | 0.0 | ||||||
27.0 | 24.468399047851562 | 11.586000442504883 | 27.183000564575195 | 0.0 | ||||||
28.0 | 24.286399841308594 | 11.753000259399414 | 28.18899917602539 | 0.0 | ||||||
29.0 | 24.134000778198242 | 11.928999900817871 | 29.195999145507812 | 0.0 | ||||||
30.0 | 23.915199279785156 | 12.083999633789062 | 30.202999114990234 | 0.0 | ||||||
31.0 | 23.698699951171875 | 12.22700023651123 | 31.209999084472656 | 0.0 | ||||||
32.0 | 23.534299850463867 | 12.347000122070312 | 32.21699905395508 | 0.0 | ||||||
33.0 | 23.395000457763672 | 12.520999908447266 | 33.2239990234375 | 0.0 | ||||||
34.0 | 23.331100463867188 | 12.630999565124512 | 34.22999954223633 | 0.0 | ||||||
35.0 | -990.0 | 0.0 | ||||||||
36.0 | 23.1564998626709 | 12.802000045776367 | 35.959999084472656 | 0.0 | ||||||
37.0 | 23.031999588012695 | 12.909000396728516 | 37.250999450683594 | 0.0 | ||||||
38.0 | 22.973100662231445 | 13.062000274658203 | 38.257999420166016 | 0.0 | ||||||
39.0 | 22.935800552368164 | 13.130999565124512 | 39.26499938964844 | 0.0 | ||||||
40.0 | -990.0 | 0.0 | ||||||||
41.0 | 22.87310028076172 | 13.199999809265137 | 40.994998931884766 | 0.0 | ||||||
42.0 | 22.849700927734375 | 13.324999809265137 | 42.2859992980957 | 0.0 | ||||||
43.0 | 22.805299758911133 | 13.411999702453613 | 43.29199981689453 | 0.0 | ||||||
44.0 | 22.726699829101562 | 13.51200008392334 | 44.29899978637695 | 0.0 | ||||||
45.0 | 22.676300048828125 | 13.569000244140625 | 45.305999755859375 | 0.0 | ||||||
46.0 | 22.611400604248047 | 13.720000267028809 | 46.3129997253418 | 0.0 | ||||||
47.0 | 22.577600479125977 | 13.781999588012695 | 47.31999969482422 | 0.0 | ||||||
48.0 | 22.550800323486328 | 13.873000144958496 | 48.32699966430664 | 0.0 | ||||||
49.0 | 22.5231990814209 | 13.96500015258789 | 49.33399963378906 | 0.0 | ||||||
50.0 | 22.4685001373291 | 14.062999725341797 | 50.340999603271484 | 0.0 | ||||||
51.0 | 22.363500595092773 | 14.170000076293945 | 51.347999572753906 | 0.0 | ||||||
52.0 | 22.25200080871582 | 14.220000267028809 | 52.35499954223633 | 0.0 | ||||||
53.0 | 22.19580078125 | 14.295000076293945 | 53.36199951171875 | 0.0 | ||||||
54.0 | 22.1466007232666 | 14.406999588012695 | 54.36899948120117 | 0.0 | ||||||
55.0 | 22.089599609375 | 14.461000442504883 | 55.375999450683594 | 0.0 | ||||||
56.0 | 22.024099349975586 | 14.593000411987305 | 56.382999420166016 | 0.0 | ||||||
57.0 | 21.99329948425293 | 14.576000213623047 | 57.38999938964844 | 0.0 | ||||||
58.0 | 21.961000442504883 | 14.32699966430664 | 58.39699935913086 | 0.0 | ||||||
59.0 | 21.94729995727539 | 14.258000373840332 | 59.40399932861328 | 0.0 | ||||||
60.0 | 21.944799423217773 | 14.350000381469727 | 60.4109992980957 | 0.0 | ||||||
61.0 | 21.920000076293945 | 14.449999809265137 | 61.417999267578125 | 0.0 | ||||||
62.0 | 21.854000091552734 | 14.522000312805176 | 62.42499923706055 | 0.0 | ||||||
63.0 | 21.784900665283203 | 14.579999923706055 | 63.43199920654297 | 0.0 | ||||||
64.0 | 21.75119972229004 | 14.692000389099121 | 64.43900299072266 | 0.0 | ||||||
65.0 | 21.713699340820312 | 14.753999710083008 | 65.44599914550781 | 0.0 | ||||||
66.0 | 21.667699813842773 | 14.814000129699707 | 66.4530029296875 | 0.0 | ||||||
67.0 | 21.641199111938477 | 14.89900016784668 | 67.45999908447266 | 0.0 | ||||||
68.0 | 21.630300521850586 | 14.977999687194824 | 68.46700286865234 | 0.0 | ||||||
69.0 | 21.624500274658203 | 15.036999702453613 | 69.4739990234375 | 0.0 | ||||||
70.0 | 21.615699768066406 | 15.10099983215332 | 70.48100280761719 | 0.0 | ||||||
71.0 | 21.577499389648438 | 15.137999534606934 | 71.48799896240234 | 0.0 | ||||||
72.0 | 21.442699432373047 | 15.15999984741211 | 72.49500274658203 | 0.0 | ||||||
73.0 | 21.329500198364258 | 15.182000160217285 | 73.50199890136719 | 0.0 | ||||||
74.0 | 21.256900787353516 | 15.170999526977539 | 74.50900268554688 | 0.0 | ||||||
75.0 | 21.174800872802734 | 15.204999923706055 | 75.51599884033203 | 0.0 | ||||||
76.0 | 21.136999130249023 | 15.230999946594238 | 76.52300262451172 | 0.0 | ||||||
77.0 | 21.109800338745117 | 15.291000366210938 | 77.52999877929688 | 0.0 | ||||||
78.0 | 21.03510093688965 | 15.345000267028809 | 78.53700256347656 | 0.0 | ||||||
79.0 | 20.9414005279541 | 15.32800006866455 | 79.54399871826172 | 0.0 | ||||||
80.0 | 20.901100158691406 | 15.38599967956543 | 80.5510025024414 | 0.0 | ||||||
81.0 | 20.87779998779297 | 15.270999908447266 | 81.55799865722656 | 0.0 | ||||||
82.0 | 20.833999633789062 | 15.170000076293945 | 82.56600189208984 | 0.0 | ||||||
83.0 | 20.748600006103516 | 15.062999725341797 | 83.572998046875 | 0.0 | ||||||
84.0 | 20.69099998474121 | 15.015999794006348 | 84.58000183105469 | 0.0 | ||||||
85.0 | 20.68120002746582 | 14.954999923706055 | 85.58699798583984 | 0.0 | ||||||
86.0 | 20.684499740600586 | 14.946000099182129 | 86.59400177001953 | 0.0 | ||||||
87.0 | 20.66069984436035 | 14.95300006866455 | 87.60099792480469 | 0.0 | ||||||
88.0 | 20.539199829101562 | 14.819999694824219 | 88.60800170898438 | 0.0 | ||||||
89.0 | 20.434600830078125 | 14.704999923706055 | 89.61499786376953 | 0.0 | ||||||
90.0 | 20.400699615478516 | 14.623000144958496 | 90.62200164794922 | 0.0 | ||||||
91.0 | 20.39940071105957 | 14.593000411987305 | 91.62999725341797 | 0.0 | ||||||
92.0 | 20.40679931640625 | 14.574999809265137 | 92.63700103759766 | 0.0 | ||||||
93.0 | 20.289899826049805 | 14.548999786376953 | 93.64399719238281 | 0.0 | ||||||
94.0 | 20.06089973449707 | 14.447999954223633 | 94.6510009765625 | 0.0 | ||||||
95.0 | 19.951400756835938 | 14.498000144958496 | 95.65799713134766 | 0.0 | ||||||
96.0 | 19.893699645996094 | 14.626999855041504 | 96.66500091552734 | 0.0 | ||||||
97.0 | 19.850000381469727 | 14.72599983215332 | 97.6729965209961 | 0.0 | ||||||
98.0 | 19.813600540161133 | 14.76200008392334 | 98.68000030517578 | 0.0 | ||||||
99.0 | 19.772899627685547 | 14.765999794006348 | 99.68699645996094 | 0.0 | ||||||
100.0 | 19.738300323486328 | 14.706000328063965 | 100.69400024414062 | 0.0 | ||||||
101.0 | 19.69529914855957 | 14.694000244140625 | 101.70099639892578 | 0.0 | ||||||
102.0 | 19.65880012512207 | 14.593000411987305 | 102.70800018310547 | 0.0 | ||||||
103.0 | 19.615999221801758 | 14.550999641418457 | 103.71600341796875 | 0.0 | ||||||
104.0 | 19.58880043029785 | 14.543999671936035 | 104.7229995727539 | 0.0 | ||||||
105.0 | 19.54599952697754 | 14.534000396728516 | 105.7300033569336 | 0.0 | ||||||
106.0 | 19.516399383544922 | 14.519000053405762 | 106.73699951171875 | 0.0 | ||||||
107.0 | 19.5221004486084 | 14.531000137329102 | 107.74400329589844 | 0.0 | ||||||
108.0 | 19.51930046081543 | 14.508999824523926 | 108.75199890136719 | 0.0 | ||||||
109.0 | 19.486600875854492 | 14.496000289916992 | 109.75900268554688 | 0.0 | ||||||
110.0 | 19.451499938964844 | 14.46399974822998 | 110.76599884033203 | 0.0 | ||||||
111.0 | 19.401199340820312 | 14.425000190734863 | 111.77300262451172 | 0.0 | ||||||
112.0 | 19.359600067138672 | 14.42199993133545 | 112.78099822998047 | 0.0 | ||||||
113.0 | -990.0 | 0.0 | ||||||||
114.0 | 19.322399139404297 | 14.375 | 114.7750015258789 | 0.0 | ||||||
115.0 | -990.0 | 0.0 | ||||||||
116.0 | 19.325700759887695 | 14.17300033569336 | 116.96299743652344 | 0.0 | ||||||
117.0 | 19.297100067138672 | 14.159000396728516 | 117.81700134277344 | 0.0 | ||||||
118.0 | -990.0 | 0.0 | ||||||||
119.0 | 19.249500274658203 | 13.861000061035156 | 120.10399627685547 | 0.0 | ||||||
120.0 | 19.267099380493164 | 13.800000190734863 | 120.83899688720703 | 0.0 | ||||||
121.0 | 19.274999618530273 | 13.496000289916992 | 121.84600067138672 | 0.0 | ||||||
122.0 | 19.249500274658203 | 13.340999603271484 | 122.85299682617188 | 0.0 | ||||||
123.0 | 19.196500778198242 | 12.930999755859375 | 123.86100006103516 | 0.0 | ||||||
124.0 | 19.147899627685547 | 12.63599967956543 | 124.86799621582031 | 0.0 | ||||||
125.0 | 19.11870002746582 | 12.496999740600586 | 125.875 | 0.0 | ||||||
126.0 | 19.103900909423828 | 12.175000190734863 | 126.88300323486328 | 0.0 | ||||||
127.0 | 19.105100631713867 | 12.133999824523926 | 127.88999938964844 | 0.0 | ||||||
128.0 | 19.08340072631836 | 12.001999855041504 | 128.89700317382812 | 0.0 | ||||||
129.0 | 19.047500610351562 | 11.965999603271484 | 129.90499877929688 | 0.0 | ||||||
130.0 | 19.003700256347656 | 11.916000366210938 | 130.91200256347656 | 0.0 | ||||||
131.0 | 18.89889907836914 | 11.829999923706055 | 131.91900634765625 | 0.0 | ||||||
132.0 | 18.81089973449707 | 11.732000350952148 | 132.927001953125 | 0.0 | ||||||
133.0 | 18.73259925842285 | 11.446999549865723 | 133.9340057373047 | 0.0 | ||||||
134.0 | 18.696199417114258 | 11.322999954223633 | 134.9409942626953 | 0.0 | ||||||
135.0 | 18.659500122070312 | 11.3100004196167 | 135.94900512695312 | 0.0 | ||||||
136.0 | 18.638399124145508 | 11.184000015258789 | 136.95599365234375 | 0.0 | ||||||
137.0 | 18.615400314331055 | 11.076000213623047 | 137.96299743652344 | 0.0 | ||||||
138.0 | 18.58530044555664 | 10.92300033569336 | 138.9709930419922 | 0.0 | ||||||
139.0 | 18.509199142456055 | 10.836999893188477 | 139.97799682617188 | 0.0 | ||||||
140.0 | 18.44659996032715 | 10.852999687194824 | 140.98500061035156 | 0.0 | ||||||
141.0 | 18.431499481201172 | 10.668999671936035 | 141.9929962158203 | 0.0 | ||||||
142.0 | 18.414199829101562 | 10.654000282287598 | 143.0 | 0.0 | ||||||
143.0 | 18.382299423217773 | 10.640000343322754 | 144.00799560546875 | 0.0 | ||||||
144.0 | 18.322999954223633 | 10.61299991607666 | 145.01499938964844 | 0.0 | ||||||
145.0 | 18.26180076599121 | 10.609000205993652 | 146.02200317382812 | 0.0 | ||||||
146.0 | 18.138500213623047 | 10.574999809265137 | 147.02999877929688 | 0.0 | ||||||
147.0 | 18.08650016784668 | 10.604999542236328 | 148.03700256347656 | 0.0 | ||||||
148.0 | -990.0 | 0.0 | ||||||||
149.0 | 18.056800842285156 | 10.489999771118164 | 149.89999389648438 | 0.0 | ||||||
150.0 | 18.058000564575195 | 10.477999687194824 | 151.05999755859375 | 0.0 | ||||||
151.0 | 18.04290008544922 | 10.472000122070312 | 152.06700134277344 | 0.0 | ||||||
152.0 | 17.988500595092773 | 10.473999977111816 | 153.07400512695312 | 0.0 | ||||||
153.0 | 17.97480010986328 | 10.468000411987305 | 154.08200073242188 | 0.0 | ||||||
154.0 | 17.98349952697754 | 10.460000038146973 | 155.08900451660156 | 0.0 | ||||||
155.0 | 17.99449920654297 | 10.430000305175781 | 156.0970001220703 | 0.0 | ||||||
156.0 | 18.01259994506836 | 10.427000045776367 | 157.10400390625 | 0.0 | ||||||
157.0 | 18.017900466918945 | 10.451000213623047 | 158.11199951171875 | 0.0 | ||||||
158.0 | 17.95159912109375 | 10.46500015258789 | 159.11900329589844 | 0.0 | ||||||
159.0 | 17.862899780273438 | 10.465999603271484 | 160.1269989013672 | 0.0 | ||||||
160.0 | -990.0 | 0.0 | ||||||||
161.0 | 17.750200271606445 | 10.293999671936035 | 161.89999389648438 | 0.0 | ||||||
162.0 | 17.681900024414062 | 10.20199966430664 | 163.1490020751953 | 0.0 | ||||||
163.0 | 17.621000289916992 | 10.10200023651123 | 164.15699768066406 | 0.0 | ||||||
164.0 | 17.573299407958984 | 10.015000343322754 | 165.16400146484375 | 0.0 | ||||||
165.0 | 17.46980094909668 | 9.951000213623047 | 166.1719970703125 | 0.0 | ||||||
166.0 | 17.417200088500977 | 9.963000297546387 | 167.1790008544922 | 0.0 | ||||||
167.0 | 17.3887996673584 | 9.970999717712402 | 168.18699645996094 | 0.0 | ||||||
168.0 | 17.33180046081543 | 9.982999801635742 | 169.19400024414062 | 0.0 | ||||||
169.0 | 17.242599487304688 | 9.940999984741211 | 170.20199584960938 | 0.0 | ||||||
170.0 | 17.14859962463379 | 9.892000198364258 | 171.20899963378906 | 0.0 | ||||||
171.0 | 17.070100784301758 | 9.826000213623047 | 172.2169952392578 | 0.0 | ||||||
172.0 | 17.027799606323242 | 9.748000144958496 | 173.2239990234375 | 0.0 | ||||||
173.0 | 16.985200881958008 | 9.640000343322754 | 174.23199462890625 | 0.0 | ||||||
174.0 | 16.938800811767578 | 9.586999893188477 | 175.23899841308594 | 0.0 | ||||||
175.0 | 16.89240074157715 | 9.571000099182129 | 176.2469940185547 | 0.0 | ||||||
176.0 | 16.865100860595703 | 9.579000473022461 | 177.25399780273438 | 0.0 | ||||||
177.0 | 16.84910011291504 | 9.585000038146973 | 178.26199340820312 | 0.0 | ||||||
178.0 | 16.811500549316406 | 9.503999710083008 | 179.27000427246094 | 0.0 | ||||||
179.0 | 16.750699996948242 | 9.472000122070312 | 180.27699279785156 | 0.0 | ||||||
180.0 | 16.69809913635254 | 9.369000434875488 | 181.28500366210938 | 0.0 | ||||||
181.0 | 16.681499481201172 | 9.154999732971191 | 182.29200744628906 | 0.0 | ||||||
182.0 | 16.65180015563965 | 8.986000061035156 | 183.3000030517578 | 0.0 | ||||||
183.0 | 16.602100372314453 | 8.902999877929688 | 184.3070068359375 | 0.0 | ||||||
184.0 | 16.554500579833984 | 8.864999771118164 | 185.31500244140625 | 0.0 | ||||||
185.0 | 16.498699188232422 | 8.817000389099121 | 186.322998046875 | 0.0 | ||||||
186.0 | 16.421199798583984 | 8.699000358581543 | 187.3300018310547 | 0.0 | ||||||
187.0 | 16.33209991455078 | 8.668000221252441 | 188.33799743652344 | 0.0 | ||||||
188.0 | 16.212900161743164 | 8.565999984741211 | 189.34500122070312 | 0.0 | ||||||
189.0 | 16.189699172973633 | 8.470999717712402 | 190.35299682617188 | 0.0 | ||||||
190.0 | 16.182899475097656 | 8.413000106811523 | 191.36099243164062 | 0.0 | ||||||
191.0 | 16.178199768066406 | 8.350000381469727 | 192.3679962158203 | 0.0 | ||||||
192.0 | 16.17099952697754 | 8.335000038146973 | 193.37600708007812 | 0.0 | ||||||
193.0 | 16.163700103759766 | 8.298999786376953 | 194.38400268554688 | 0.0 | ||||||
194.0 | 16.142799377441406 | 8.276000022888184 | 195.39100646972656 | 0.0 | ||||||
195.0 | 16.099199295043945 | 8.234999656677246 | 196.3990020751953 | 0.0 | ||||||
196.0 | 16.05389976501465 | 8.206999778747559 | 197.40699768066406 | 0.0 | ||||||
197.0 | 16.009899139404297 | 8.14900016784668 | 198.41400146484375 | 0.0 | ||||||
198.0 | 15.967700004577637 | 8.065999984741211 | 199.4219970703125 | 0.0 | ||||||
199.0 | 15.950499534606934 | 7.941999912261963 | 200.42999267578125 | 0.0 | ||||||
200.0 | 15.937100410461426 | 7.839000225067139 | 201.43699645996094 | 0.0 | ||||||
201.0 | 15.879500389099121 | 7.732999801635742 | 202.44500732421875 | 0.0 | ||||||
202.0 | 15.819499969482422 | 7.697000026702881 | 203.4530029296875 | 0.0 | ||||||
203.0 | 15.746899604797363 | 7.644000053405762 | 204.4600067138672 | 0.0 | ||||||
204.0 | 15.673100471496582 | 7.590000152587891 | 205.46800231933594 | 0.0 | ||||||
205.0 | 15.531999588012695 | 206.4759979248047 | 0.0 |
In total, there are 205 rows of distinct combinations of the variables listed above.
All of the rows are shown above.
To change the maximum number of rows displayed, change View : Distinct Data above.
To view the related data counts,
check View : Related Data Counts above and select a value for one of the variables above.
WARNING: This may involve lots of data.
For some datasets, this may be slow.
Consider using this only when you need it and
have selected a small subset of the data.
Related Data (Metadata) (Refine the data subset and/or download the data)
To view the related data, change View : Related Data above.
WARNING: This may involve lots of data. For some datasets, this may be slow. Consider using this only when you need it and have selected a small subset of the data.