cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.1594/pangaea.145716
title: Tree-ring width of Quercus species from historical object sample 6462B/03A, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 111; first year: 1417; end year: 1528; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.146011
title: Tree-ring width of Quercus species from historical object sample 6344B/01A, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 62; first year: 1392; end year: 1454; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.148119
title: Tree-ring width of Quercus species from historical object sample 5526B/08A, Netherlands, Zeyen Gemeente Tynaarlo

description: Species: Quercus species; No of rings: 111; first year: 1380; end year: 1491; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 1; Last ring under bark: absent
DOI: 10.1594/pangaea.145703
title: Tree-ring width of Quercus species from historical object sample 6463B/13A, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 90; first year: 1366; end year: 1456; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 11; Last ring under bark: absent
DOI: 10.1594/pangaea.145729
title: Tree-ring width of Quercus species from historical object sample 6452B/04A, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 24; first year: 1496; end year: 1520; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.145733
title: Tree-ring width of Quercus species from historical object sample 6451B/07M, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 100; first year: 1310; end year: 1410; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.148128
title: Tree-ring width of Quercus species from historical object sample 5521B/05A, Netherlands, Zutphen

description: Species: Quercus species; No of rings: 21; first year: 1404; end year: 1425; Pith: not applicable; Heartwood: complete; Sapwood: complete; Number of sapwood rings: 8; Last ring under bark: present
DOI: 10.1594/pangaea.148130
title: Tree-ring width of Quercus species from historical object sample 5521B/03A, Netherlands, Zutphen

description: Species: Quercus species; No of rings: 25; first year: 1389; end year: 1414; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 4; Last ring under bark: absent
DOI: 10.1594/pangaea.145810
title: Tree-ring width of Quercus species from historical object sample 6425B/05A, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 116; first year: 1433; end year: 1549; Pith: not applicable; Heartwood: complete; Sapwood: complete; Number of sapwood rings: 22; Last ring under bark: present
DOI: 10.1594/pangaea.146017
title: Tree-ring width of Quercus species from historical object sample 6340B/05B, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 94; first year: 1374; end year: 1468; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.145862
title: Tree-ring width of Pinus sylvestris from historical object sample 6404B/06A, Netherlands, Midwolda

description: Species: Pinus sylvestris; No of rings: 128; first year: 1585; end year: 1713; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 50; Last ring under bark: absent
DOI: 10.1594/pangaea.145900
title: Tree-ring width of Quercus species from historical object sample 6361B/05A, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 60; first year: 1404; end year: 1464; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 11; Last ring under bark: absent
DOI: 10.1594/pangaea.146034
title: Tree-ring width of Quercus species from historical object sample 6339B/20A, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 58; first year: 1359; end year: 1417; Pith: not applicable; Heartwood: complete; Sapwood: complete; Number of sapwood rings: 14; Last ring under bark: present
DOI: 10.1594/pangaea.146020
title: Tree-ring width of Quercus species from historical object sample 6340B/03A, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 55; first year: 1431; end year: 1486; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.146121
title: Tree-ring width of Quercus species from historical object sample 6311B/03A, Netherlands, Haarlem

description: Species: Quercus species; No of rings: 125; first year: 1334; end year: 1459; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 7; Last ring under bark: absent
DOI: 10.1594/pangaea.145792
title: Tree-ring width of Quercus species from historical object sample 6432B/04C, Netherlands, Groningen

description: Species: Quercus species; No of rings: 97; first year: 1494; end year: 1591; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.145978
title: Tree-ring width of Quercus species from historical object sample 6351B/01B, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 115; first year: 1337; end year: 1452; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 9; Last ring under bark: absent
DOI: 10.1594/pangaea.145790
title: Tree-ring width of Quercus species from historical object sample 6432B/06A, Netherlands, Groningen

description: Species: Quercus species; No of rings: 81; first year: 1365; end year: 1446; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.146024
title: Tree-ring width of Quercus species from historical object sample 6339B/30M, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 203; first year: 1213; end year: 1416; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.145904
title: Tree-ring width of Quercus species from historical object sample 6361B/01A, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 141; first year: 1374; end year: 1515; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.145909
title: Tree-ring width of Quercus species from historical object sample 6357B/06A, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 86; first year: 1347; end year: 1433; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 4; Last ring under bark: absent
DOI: 10.1594/pangaea.145987
title: Tree-ring width of Quercus species from historical object sample 6350B/05A, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 63; first year: 1346; end year: 1409; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.146028
title: Tree-ring width of Quercus species from historical object sample 6339B/24B, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 108; first year: 1297; end year: 1405; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 1; Last ring under bark: absent
DOI: 10.1594/pangaea.146183
title: Tree-ring width of Quercus species from historical object sample 6292B/04A, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 182; first year: 1343; end year: 1525; Pith: not applicable; Heartwood: complete; Sapwood: complete; Number of sapwood rings: 24; Last ring under bark: present
DOI: 10.1594/pangaea.146105
title: Tree-ring width of Quercus species from historical object sample 6321B/11M, Netherlands, Castenray

description: Species: Quercus species; No of rings: 61; first year: 1716; end year: 1777; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.146835
title: Tree-ring width of Quercus species from historical object sample 6062B/04A, Netherlands, Groningen

description: Species: Quercus species; No of rings: 33; first year: 1433; end year: 1466; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.145806
title: Tree-ring width of Quercus species from historical object sample 6429B/04A, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 46; first year: 1368; end year: 1414; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.145994
title: Tree-ring width of Quercus species from historical object sample 6349B/01A, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 113; first year: 1345; end year: 1458; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.146146
title: Tree-ring width of Quercus species from historical object sample 6307B/04A, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 83; first year: 1358; end year: 1441; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 1; Last ring under bark: absent
DOI: 10.1594/pangaea.146841
title: Tree-ring width of Quercus species from historical object sample 6061B/06A, Netherlands, Groningen

description: Species: Quercus species; No of rings: 175; first year: 1395; end year: 1570; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.146895
title: Tree-ring width of Quercus species from historical object sample 6048B/01A, Netherlands, Bronckhorst

description: Species: Quercus species; No of rings: 59; first year: 1203; end year: 1262; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 8; Last ring under bark: absent
DOI: 10.1594/pangaea.146971
title: Tree-ring width of Quercus species from historical object sample 6033B/04A, Netherlands, Diever

description: Species: Quercus species; No of rings: 58; first year: 1698; end year: 1756; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 12; Last ring under bark: absent
DOI: 10.1594/pangaea.146843
title: Tree-ring width of Quercus species from historical object sample 6061B/04A, Netherlands, Groningen

description: Species: Quercus species; No of rings: 135; first year: 1463; end year: 1598; Pith: not applicable; Heartwood: complete; Sapwood: complete; Number of sapwood rings: 18; Last ring under bark: present
DOI: 10.1594/pangaea.146902
title: Tree-ring width of Quercus species from historical object sample 6046B/03A, Netherlands, Donkerbroek

description: Species: Quercus species; No of rings: 39; first year: 1516; end year: 1555; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 2; Last ring under bark: absent
DOI: 10.1594/pangaea.146249
title: Tree-ring width of Quercus species from historical object sample 6266B/03A, Netherlands, Wijster

description: Species: Quercus species; No of rings: 132; first year: 1453; end year: 1585; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 2; Last ring under bark: absent
DOI: 10.1594/pangaea.146852
title: Tree-ring width of Pinus sylvestris from historical object sample 6058B/02A, Netherlands, Groningen

description: Species: Pinus sylvestris; No of rings: 79; first year: 1496; end year: 1575; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 17; Last ring under bark: absent
DOI: 10.1594/pangaea.146252
title: Tree-ring width of Quercus species from historical object sample 6250B/07A, Netherlands, 's-Hertogenbosch

description: Species: Quercus species; No of rings: 103; first year: 1404; end year: 1507; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.146271
title: Tree-ring width of Quercus species from historical object sample 6239B/01A, Netherlands, Groningen

description: Species: Quercus species; No of rings: 199; first year: 1344; end year: 1543; Pith: not applicable; Heartwood: complete; Sapwood: complete; Number of sapwood rings: 20; Last ring under bark: present
DOI: 10.1594/pangaea.146272
title: Tree-ring width of Quercus species from historical object sample 6238B/09M, Netherlands, Groningen

description: Species: Quercus species; No of rings: 134; first year: 1405; end year: 1539; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.146920
title: Tree-ring width of Quercus species from historical object sample 6042B/04A, Netherlands, Peize

description: Species: Quercus species; No of rings: 107; first year: 1354; end year: 1461; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 1; Last ring under bark: absent
DOI: 10.1594/pangaea.146928
title: Tree-ring width of Quercus species from historical object sample 6041B/15A, Netherlands, Peize

description: Species: Quercus species; No of rings: 86; first year: 1586; end year: 1672; Pith: not applicable; Heartwood: complete; Sapwood: complete; Number of sapwood rings: 17; Last ring under bark: present
DOI: 10.60508/0ta5-v163
title: Stanford Sleep Bench

description: The Sleep-Bench dataset is a collection of clinical polysomnography (PSG)
recordings from Stanford Sleep Clinic. It consists of 17.467 PSG recordings
spanning 163,650 hours. The dataset is accompanied by a codebase for
benchmarking models in the  Sleep-Bench GitHub repository.
DOI: 10.60508/yhsn-dc31
title: Stanford Sleep Bench

description: The Sleep-Bench dataset is a collection of clinical polysomnography (PSG)
recordings from Stanford Sleep Clinic. It consists of 17.467 PSG recordings
spanning 163,650 hours. The dataset is accompanied by a codebase for
benchmarking models in the  Sleep-Bench GitHub repository.
DOI: 10.1594/pangaea.146931
title: Tree-ring width from historical object sample 6041B/12M, Netherlands, Peize

description: Species: not given; No of rings: 100; first year: 1563; end year: 1663; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.146176
title: Tree-ring width of Quercus species from historical object sample 6296B/07A, Netherlands, Velp

description: Species: Quercus species; No of rings: 48; first year: 263; end year: 311; Pith: not applicable; Heartwood: complete; Sapwood: complete; Number of sapwood rings: 29; Last ring under bark: present
DOI: 10.1594/pangaea.146177
title: Tree-ring width of Quercus species from historical object sample 6296B/04A, Netherlands, Velp

description: Species: Quercus species; No of rings: 36; first year: 269; end year: 305; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 5; Last ring under bark: absent
DOI: 10.1594/pangaea.146173
title: Tree-ring width of Quercus species from historical object sample 6296B/15A, Netherlands, Velp

description: Species: Quercus species; No of rings: 66; first year: 265; end year: 331; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.146912
title: Tree-ring width of Quercus species from historical object sample 6043B/02A, Netherlands, Leiden

description: Species: Quercus species; No of rings: 72; first year: 1536; end year: 1608; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 21; Last ring under bark: absent
DOI: 10.1594/pangaea.146839
title: Tree-ring width of Quercus species from historical object sample 6061B/08A, Netherlands, Groningen

description: Species: Quercus species; No of rings: 105; first year: 1476; end year: 1581; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 2; Last ring under bark: absent
DOI: 10.1594/pangaea.146959
title: Tree-ring width of Quercus species from historical object sample 6033B/16A, Netherlands, Diever

description: Species: Quercus species; No of rings: 111; first year: 1648; end year: 1759; Pith: not applicable; Heartwood: complete; Sapwood: complete; Number of sapwood rings: 14; Last ring under bark: present
DOI: 10.1594/pangaea.146961
title: Tree-ring width of Quercus species from historical object sample 6033B/14A, Netherlands, Diever

description: Species: Quercus species; No of rings: 97; first year: 1662; end year: 1759; Pith: not applicable; Heartwood: complete; Sapwood: complete; Number of sapwood rings: 25; Last ring under bark: present
DOI: 10.1594/pangaea.146243
title: Tree-ring width of Quercus species from historical object sample 6267B/01A, Netherlands, Noordsleen

description: Species: Quercus species; No of rings: 147; first year: 1435; end year: 1582; Pith: not applicable; Heartwood: complete; Sapwood: complete; Number of sapwood rings: 20; Last ring under bark: present
DOI: 10.1594/pangaea.146915
title: Tree-ring width of Quercus species from historical object sample 6042B/09A, Netherlands, Peize

description: Species: Quercus species; No of rings: 92; first year: 1578; end year: 1670; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 14; Last ring under bark: absent
DOI: 10.1594/pangaea.146853
title: Tree-ring width of Pinus sylvestris from historical object sample 6058B/01A, Netherlands, Groningen

description: Species: Pinus sylvestris; No of rings: 97; first year: 1529; end year: 1626; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 43; Last ring under bark: absent
DOI: 10.1594/pangaea.146922
title: Tree-ring width of Quercus species from historical object sample 6042B/02A, Netherlands, Peize

description: Species: Quercus species; No of rings: 50; first year: 1624; end year: 1674; Pith: not applicable; Heartwood: complete; Sapwood: complete; Number of sapwood rings: 19; Last ring under bark: present
DOI: 10.1594/pangaea.146251
title: Tree-ring width of Quercus species from historical object sample 6266B/01A, Netherlands, Wijster

description: Species: Quercus species; No of rings: 120; first year: 1483; end year: 1603; Pith: not applicable; Heartwood: complete; Sapwood: complete; Number of sapwood rings: 25; Last ring under bark: present
DOI: 10.1594/pangaea.146926
title: Tree-ring width of Quercus species from historical object sample 6041B/17A, Netherlands, Peize

description: Species: Quercus species; No of rings: 46; first year: 1618; end year: 1664; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 1; Last ring under bark: absent
DOI: 10.1594/pangaea.146358
title: Tree-ring width of Quercus species from historical object sample 6201B/03A, Netherlands, Zutphen

description: Species: Quercus species; No of rings: 94; first year: 1294; end year: 1388; Pith: not applicable; Heartwood: complete; Sapwood: complete; Number of sapwood rings: 18; Last ring under bark: present
DOI: 10.1594/pangaea.147322
title: Tree-ring width of Quercus species from historical object sample 5929B/08A, Netherlands, Leiden

description: Species: Quercus species; No of rings: 37; first year: 1450; end year: 1487; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 5; Last ring under bark: absent
DOI: 10.1594/pangaea.146337
title: Tree-ring width of Quercus species from historical object sample 6214B/02A, Netherlands, Meppel

description: Species: Quercus species; No of rings: 66; first year: 1587; end year: 1653; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.146338
title: Tree-ring width of Quercus species from historical object sample 6214B/01A, Netherlands, Meppel

description: Species: Quercus species; No of rings: 58; first year: 1475; end year: 1533; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 7; Last ring under bark: absent
DOI: 10.1594/pangaea.146336
title: Tree-ring width of Quercus species from historical object sample 6214B/03A, Netherlands, Meppel

description: Species: Quercus species; No of rings: 49; first year: 1475; end year: 1524; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent
DOI: 10.1594/pangaea.146359
title: Tree-ring width of Quercus species from historical object sample 6201B/02A, Netherlands, Zutphen

description: Species: Quercus species; No of rings: 73; first year: 1314; end year: 1387; Pith: not applicable; Heartwood: complete; Sapwood: complete; Number of sapwood rings: 13; Last ring under bark: present
DOI: 10.1594/pangaea.146976
title: Tree-ring width of Pinus sylvestris from historical object sample 6032B/14A, Netherlands, Vierhuizen

description: Species: Pinus sylvestris; No of rings: 96; first year: 1524; end year: 1620; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 28; Last ring under bark: absent
DOI: 10.1594/pangaea.146978
title: Tree-ring width of Pinus sylvestris from historical object sample 6032B/12A, Netherlands, Vierhuizen

description: Species: Pinus sylvestris; No of rings: 168; first year: 1466; end year: 1634; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 57; Last ring under bark: absent
DOI: 10.1594/pangaea.146886
title: Tree-ring width of Pinus sylvestris from historical object sample 6056B/03A, Netherlands, Groningen

description: Species: Pinus sylvestris; No of rings: 96; first year: 1472; end year: 1568; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 24; Last ring under bark: absent
DOI: 10.1594/pangaea.146894
title: Tree-ring width of Quercus species from historical object sample 6048B/01B, Netherlands, Bronckhorst

description: Species: Quercus species; No of rings: 64; first year: 1201; end year: 1265; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 16; Last ring under bark: absent
DOI: 10.1594/pangaea.146988
title: Tree-ring width of Quercus species from historical object sample 6032B/02A, Netherlands, Vierhuizen

description: Species: Quercus species; No of rings: 53; first year: 1534; end year: 1587; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 1; Last ring under bark: absent
DOI: 10.1594/pangaea.146910
title: Tree-ring width of Quercus species from historical object sample 6043B/04A, Netherlands, Leiden

description: Species: Quercus species; No of rings: 93; first year: 1517; end year: 1610; Pith: not applicable; Heartwood: complete; Sapwood: incomplete; Number of sapwood rings: 20; Last ring under bark: absent
DOI: 10.1594/pangaea.147236
title: Tree-ring width of Quercus species from historical object sample 5949B/10A, Netherlands, Winterswijk

description: Species: Quercus species; No of rings: 167; first year: 1567; end year: 1734; Pith: not applicable; Heartwood: complete; Sapwood: complete; Number of sapwood rings: 18; Last ring under bark: present