cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.15468/dl.h83nfr
title: Occurrence Download

description: A dataset containing 174 species occurrences available in GBIF matching the query:
{
 "and" : [
 "GadmGid is TWN.7_1",
 "OccurrenceStatus is Present",
 "TaxonKey is Abies kawakamii (Hayata) T.Itô"
 ]
}

 The dataset includes 174 records from 7 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0083119-210914110416597/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.gfhzly
title: Occurrence Download

description: A dataset containing 385 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Euonymus nanus M.Bieb."
 ]
}

 The dataset includes 385 records from 55 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0016856-190918142434337/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.oxgmjk
title: Occurrence Download

description: A dataset containing 2090 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Indigofera trita L.f."
 ]
}

 The dataset includes 2090 records from 80 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0009203-180131172636756/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.vcvu8f
title: Occurrence Download

description: A dataset containing 784191 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Pelecanus erythrorhynchos Gmelin, 1789"
 ]
}

 The dataset includes 784191 records from 125 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0020574-200221144449610/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.9oxcxz
title: Occurrence Download

description: A dataset containing 3010 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Agave sisalana Perrine"
 ]
}

 The dataset includes 3010 records from 90 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0016854-190918142434337/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.nksdca
title: Occurrence Download

description: A dataset containing 56 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Hakea obtusa Meisn.",
 {
 "or" : [
 "BasisOfRecord is Human Observation",
 "BasisOfRecord is Observation"
 ]
 },
 "HasCoordinate is true",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 56 records from 4 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0045457-191105090559680/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.h8nvmh
title: Occurrence Download

description: A dataset containing 128 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Country is Chinese Taipei",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 {
 "or" : [
 "TaxonKey is Abies kawakamii (Hayata) Ito",
 "TaxonKey is Abies kaempferi (Lamb.) Lindl."
 ]
 }
 ]
}

 The dataset includes 128 records from 4 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0083120-210914110416597/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.fvtmlc
title: Occurrence Download

description: A dataset containing 3580 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Emex spinosa (L.) Campd."
 ]
}

 The dataset includes 3580 records from 117 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0008071-191105090559680/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.89ag7r
title: Occurrence Download

description: A dataset containing 10870 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Geometry POLYGON((-87.55911 29.90263,-78.85818 30.17566,-78.85818 51.92495,-86.93822 52.35022,-87.55911 29.90263))",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "OccurrenceStatus is Present",
 "TaxonKey is Liquidambar styraciflua L."
 ]
}

 The dataset includes 10870 records from 63 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0114536-230224095556074/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.mxrggw
title: Occurrence Download

description: A dataset containing 634 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Trachylepis punctatissima (Smith, 1849)"
 ]
}

 The dataset includes 634 records from 20 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0283886-210914110416597/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.tde5nj
title: Occurrence Download

description: A dataset containing 890 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Ornithogalum pyramidale L."
 ]
}

 The dataset includes 890 records from 82 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0034305-230810091245214/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.4prcvd
title: Occurrence Download

description: A dataset containing 158 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Eleutherodactylus modestus (Taylor, 1942)"
 ]
}

 The dataset includes 158 records from 17 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0298918-210914110416597/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.p2cxfu
title: Occurrence Download

description: A dataset listing the 5052 species recorded in GBIF matching the query:
{
 "and" : [
 "Country is Sudan",
 "OccurrenceStatus is Present",
 "TaxonKey is Plantae"
 ]
}

 The dataset's 5052 records were derived from 144 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0034294-230810091245214/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.xzm7yy
title: Occurrence Download

description: A dataset containing 16 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Continent is Europe",
 "Country is one of (Serbia, Austria, France, Switzerland, Poland)",
 "TaxonKey is Cheilosia gagatea Loew, 1857"
 ]
}

 The dataset includes 16 records from 6 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0002943-230918134249559/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.4bwkfg
title: Occurrence Download

description: A dataset containing 5037 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Geometry POLYGON((-87.55911 29.90263,-78.85818 30.17566,-78.85818 51.92495,-86.93822 52.35022,-87.55911 29.90263))",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "OccurrenceStatus is Present",
 "TaxonKey is Quercus alba L."
 ]
}

 The dataset includes 5037 records from 64 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0114539-230224095556074/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.tgtsys
title: Occurrence Download

description: A dataset containing 12150103 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Country is Ecuador",
 "OccurrenceStatus is Present"
 ]
}

 The dataset includes 12150103 records from 2283 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0000437-241007104925546/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.vdpvcs
title: Occurrence Download

description: A dataset containing 0 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Chiloglanis pretoriae Van Der Horst, 1931",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "BasisOfRecord is one of (Specimen, Living Specimen, Observation, Human Observation, Machine Observation, Material sample, Literature Occurrence, Material citation, Occurrence evidence)",
 "Geometry POLYGON ((20.7576 -24.3688,20.529 -24.0715,20.509 -24.0715,20.509 -28.5786,25.5395 -28.5786,25.5395 -24.0715,25.1306 -24.0715,24.9333 -24.4571,23.8962 -24.2467,22.8065 -24.295,22.3719 -24.7207,22.2323 -25.547,22.0387 -25.7188,21.7833 -25.7784,21.5388 -25.7113,21.3553 -25.5415,20.7576 -24.3688))"
 ]
}

 The dataset includes 0 records from 0 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0024715-250525065834625/datasets/export for details.
DOI: 10.25549/examiner-c44-83160
title: Interview, 1954

description: 4 images. Interview, 22 April 1954. Senator Thomas Kuchel.; Caption slip reads: "Photographer: Monteverde. Date: 1954-04-22. Reporter: Greenberg. Assignment: Sen. Kuchel. 43/44/45/46: Sen. Thomas Kuchel".
DOI: 10.15468/dl.opddlv
title: Occurrence Download

description: A dataset containing 130 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Microtus mongolicus (Radde, 1862)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 130 records from 5 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0052260-160910150852091/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.kynrxx
title: Occurrence Download

description: A dataset containing 6732 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Panthera onca (Linnaeus, 1758)"
 ]
}

 The dataset includes 6732 records from 241 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0197888-230224095556074/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.aukvaf
title: Occurrence Download

description: A dataset containing 738 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Ficus sundaica Blume"
 ]
}

 The dataset includes 738 records from 29 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0012879-240321170329656/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.c857w9
title: Occurrence Download

description: A dataset containing 6 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Geometry POLYGON((1.7147 50.82218,1.72135 50.82218,1.72135 50.82623,1.7147 50.82623,1.7147 50.82218))",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 6 records from 2 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0197561-230224095556074/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.cdpb3g
title: Occurrence Download

description: A dataset containing 102 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Chaetocercus berlepschi Simon, 1889"
 ]
}

 The dataset includes 102 records from 9 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0052262-160910150852091/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25549/examiner-c44-82912
title: American Cancer Society, 1954

description: 2 images. American Cancer Society, 26 April 1954. Mrs. Alfred T. Chamie; Mrs. Mortimer Singer Junior. (Handout).; Supplementary material reads: "American Cancer Society, 9708 Santa Monica Blvd., Beverly Hills, California, Cr. 6 -1422, Gerry Fitz-Gerald. Cutline for negative. Planning the grand final report luncheon of the American Cancer Society are Mrs. Alfred T. Chamie and Mrs. Mortimer Singer Jr. Event will be held in Riviera Country Club Monday noon. (Note: Since these two gals changed places I'm not sure which is one whose left. Chamie is the one with the light gray hair - Singer is dark)".
DOI: 10.15468/dl.zdjvqu
title: Occurrence Download

description: A dataset containing 117 species occurrences available in GBIF matching the query:
{
 "and" : [
 "CoordinateUncertaintyInMeters 0.0-100.0",
 "Country is Canada",
 "OccurrenceStatus is Present",
 "StateProvince is ALberta",
 "TaxonKey is Bouteloua gracilis (Kunth) Lag. ex Griffiths",
 "Year 1970-2024"
 ]
}

 The dataset includes 117 records from 2 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0023816-240229165702484/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.5f566b
title: Occurrence Download

description: A dataset containing 19 species occurrences available in GBIF matching the query:
{
 "and" : [
 {
 "and" : [
 "HasGeospatialIssue is false",
 "HasCoordinate is true",
 "OccurrenceStatus is Present",
 {
 "not" : {
 "BasisOfRecord" : [
 "is one of (Fossil, Living Specimen)"
 ]
 }
 }
 ]
 },
 "TaxonKey is Brachycephalus didactylus (Izecksohn, 1971)"
 ]
}

 The dataset includes 19 records from 4 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0023829-240229165702484/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.eipbsp
title: Occurrence Download

description: A dataset containing 3361 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Country is Cambodia",
 "DatasetKey is Naturalis Biodiversity Center (NL) - Botany"
 ]
}

 The dataset includes 3361 records from 1 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0052265-160910150852091/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.zs6328
title: Occurrence Download

description: A dataset containing 13 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Epimedium multiflorum T.S.Ying"
 ]
}

 The dataset includes 13 records from 3 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0197572-230224095556074/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25549/examiner-c44-82751
title: Armstrong (Officer) bribery case, 1954

description: 5 images. Armstrong (Officer) bribery case, 29 June 1954. Lois Horstman; Bernard C. Armstrong; Charles Maraganis.; Caption slip reads: "Photographer: Hecht. Date: 1954-06-29. Reporter: McMahon. Assignment: Cop Bribery Case. 20/21: Lois Horstman (blonde gal); 40/41: Bernard C. Armstrong (white shirt-yellow tie); 78: Chas. Maraganis (Red jacket)".
DOI: 10.15468/dl.jdtb4c
title: Occurrence Download

description: A dataset containing 11300 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Gallirallus striatus (Linnaeus, 1766)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "OccurrenceStatus is Present",
 {
 "not" : {
 "BasisOfRecord" : [
 "is one of (Fossil, Living Specimen)"
 ]
 }
 }
 ]
}

 The dataset includes 11300 records from 39 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0023832-240229165702484/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.x48ba4
title: Occurrence Download

description: A dataset containing 186 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Phyllotis haggardi Thomas, 1898"
 ]
}

 The dataset includes 186 records from 15 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0052268-160910150852091/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.ytqr5v
title: Occurrence Download

description: A dataset containing 11 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Epimedium latisepalum Stearn"
 ]
}

 The dataset includes 11 records from 8 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0197565-230224095556074/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.bc5g7a
title: Occurrence Download

description: A dataset containing 76 species occurrences available in GBIF matching the query:
{
 "and" : [
 {
 "and" : [
 "HasGeospatialIssue is false",
 "HasCoordinate is true",
 "OccurrenceStatus is Present",
 {
 "not" : {
 "BasisOfRecord" : [
 "is one of (Fossil, Living Specimen)"
 ]
 }
 }
 ]
 },
 "TaxonKey is Physalaemus moreirae (Miranda-Ribeiro, 1937)"
 ]
}

 The dataset includes 76 records from 6 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0023839-240229165702484/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.uqcfck
title: Occurrence Download

description: A dataset containing 2637 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Canis lupus Linnaeus, 1758",
 "Country is Spain"
 ]
}

 The dataset includes 2637 records from 12 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0052269-160910150852091/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25549/examiner-c44-53225
title: Pie throwing (University of Southern California), 1954

description: 15 images. Pie throwing (University of Southern California), 5 April 1954. John Garr; Wells Martell; Doctor Harvey J. Locke; Johanna Pick (member of El Rodeo Yearbook Staff); Warren Clendening (Student Body president); George Root (Senior Class president); Bill Van Alstyne (candidate for student body president); Janelle Armstead.; Caption slip reads: "Photographer: Rustan. Date; 04-05. Reporter: Adler. Assignment: Pie throwing, USC. 59/60, 73/74: Dr. Harvey J. Locke, professor of sociology, getting hit with pies. 89/90, 39/40: Johanna Pick, member of El rodeo yearbook staff, getting hit. 5/6/33/34: Bill Van Alstyne, candidate for student body president, gets hit. 65/66/79: George Root, senior class prexy, getting hit with pie. 80/3: Warren Clendening, student body president, getting hit. 4: John Garr, prexy of School of Letters Arts and Sciences, gets hit by Janelle Armstead".
DOI: 10.15468/dl.ncuqjg
title: Occurrence Download

description: A dataset containing 10 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Epimedium ogisui Stearn"
 ]
}

 The dataset includes 10 records from 7 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0197574-230224095556074/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.nxeb2e
title: Occurrence Download

description: A dataset containing 722351 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Molinia caerulea (L.) Moench)",
 "HasCoordinate is true"
 ]
}

 The dataset includes 722351 records from 1560 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0037925-240506114902167/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.5281/zenodo.10653690
title: Dataset for the study "Deep Learning-Based Precipitation Simulation for Different Types of  Weather Events in Eastern China"

description: This dataset contains the data and codes used in the study "Deep Learning-Based Precipitation Simulation for Different Types of  Weather Events in Eastern China". The resources will be updated continously.
DOI: 10.5281/zenodo.10653691
title: Dataset for the study "Deep Learning-Based Precipitation Simulation for Different Types of  Weather Events in Eastern China"

description: This dataset contains the data and codes used in the  study "Deep Learning-Based Precipitation Simulation for Different Types of  Weather Events in Eastern China". Full resources will be released once the paper is published.
DOI: 10.15468/dl.8hby9f
title: Occurrence Download

description: A dataset listing the 15545 species recorded in GBIF matching the query:
{
 "Geometry" : [
 "POLYGON((18.74926 70.16462,18.50436 70.037,17.91799 69.6162,18.48711 69.40235,18.62567 69.05185,19.49774 69.19884,20.22552 69.40924,20.45317 69.65759,20.49801 69.99906,20.091 70.27845,19.63226 70.40262,19.17351 70.39227,18.74926 70.16462))"
 ]
}

 The dataset's 15545 records were derived from 363 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0008748-240626123714530/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.5281/zenodo.12600183
title: Edgcomb, V.P. IODP 385
DOI: 10.5281/zenodo.12600184
title: Edgcomb, V.P. IODP 385
DOI: 10.15468/dl.tt6gsu
title: Occurrence Download

description: A dataset containing 84 species occurrences available in GBIF matching the query:
{
 "and" : [
 "BasisOfRecord is Specimen",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "TaxonKey is Rhabdornis mystacalis (Temminck, 1825)"
 ]
}

 The dataset includes 84 records from 14 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0008775-240626123714530/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25574/00542
title: Chandra X-ray Observatory ObsId 00542

description: DETERMINATION OF H0/Q0
DOI: 10.15468/dl.rjhqnj
title: Occurrence Download

description: A dataset containing 208 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Phoradendron falcifrons (Hook. & Arn.) Eichler"
 ]
}

 The dataset includes 208 records from 37 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0008776-240626123714530/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.hv329x
title: Occurrence Download

description: A dataset containing 321 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Piper tucumanum C.DC."
 ]
}

 The dataset includes 321 records from 25 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0008777-240626123714530/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.5281/zenodo.12617907
title: Fiber-optic seismic sensing of vadose zone soil moisture dynamics data sets

description: CC_daily.h5: Daily cross-correlation functions for common-offset DAS channels.

RCC_dv_v_full.csv: Summary of all the measured dv/v from the ballistic surface waves in daily cross-correlation functions.