3-D Modelling of Megaloolithid Clutches: Insights about Nest Construction and Dinosaur Behaviour
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{"title"=>"3-D modelling of megaloolithid clutches: Insights about nest construction and dinosaur behaviour", "type"=>"journal", "authors"=>[{"first_name"=>"Bernat", "last_name"=>"Vila", "scopus_author_id"=>"22636101700"}, {"first_name"=>"Frankie D.", "last_name"=>"Jackson", "scopus_author_id"=>"7201874579"}, {"first_name"=>"Josep", "last_name"=>"Fortuny", "scopus_author_id"=>"16177500700"}, {"first_name"=>"Albert G.", "last_name"=>"Sellés", "scopus_author_id"=>"36459128600"}, {"first_name"=>"Àngel", "last_name"=>"Galobart", "scopus_author_id"=>"55964223000"}], "year"=>2010, "source"=>"PLoS ONE", "identifiers"=>{"sgr"=>"77956414098", "pmid"=>"20463953", "pui"=>"359494448", "isbn"=>"1932-6203", "scopus"=>"2-s2.0-77956414098", "doi"=>"10.1371/journal.pone.0010362", "issn"=>"19326203"}, "id"=>"26592bff-3cc9-34b6-9447-83475ca68735", "abstract"=>"BACKGROUND: Megaloolithid eggs have long been associated with sauropod dinosaurs. Despite their extensive and worldwide fossil record, interpretations of egg size and shape, clutch morphology, and incubation strategy vary. The Pinyes locality in the Upper Cretaceous Tremp Formation in the southern Pyrenees, Catalonia provides new information for addressing these issues. Nine horizons containing Megaloolithus siruguei clutches are exposed near the village of Coll de Nargó. Tectonic deformation in the study area strongly influenced egg size and shape, which could potentially lead to misinterpretation of reproductive biology if 2D and 3D maps are not corrected for bed dip that results from tectonism. METHODOLOGY/FINDINGS: Detailed taphonomic study and three-dimensional modelling of fossil eggs show that intact M. siruguei clutches contained 20-28 eggs, which is substantially larger than commonly reported from Europe and India. Linear and grouped eggs occur in three superimposed levels and form an asymmetric, elongate, bowl-shaped profile in lateral view. Computed tomography data support previous interpretations that the eggs hatched within the substrate. Megaloolithid clutch sizes reported from other European and Indian localities are typically less than 15 eggs; however, these clutches often include linear or grouped eggs that resemble those of the larger Pinyes clutches and may reflect preservation of incomplete clutches. CONCLUSIONS/SIGNIFICANCE: We propose that 25 eggs represent a typical megaloolithid clutch size and smaller egg clusters that display linear or grouped egg arrangements reported at Pinyes and other localities may represent eroded remnants of larger clutches. The similarity of megaloolithid clutch morphology from localities worldwide strongly suggests common reproductive behaviour. The distinct clutch geometry at Pinyes and other localities likely resulted from the asymmetrical, inclined, and laterally compressed titanosaur pes unguals of the female, using the hind foot for scratch-digging during nest excavation.", "link"=>"http://www.mendeley.com/research/3d-modelling-megaloolithid-clutches-insights-about-nest-construction-dinosaur-behaviour", "reader_count"=>53, "reader_count_by_academic_status"=>{"Unspecified"=>1, "Professor > Associate Professor"=>2, "Researcher"=>12, "Student > Doctoral Student"=>4, "Student > Ph. D. Student"=>12, "Student > Postgraduate"=>1, "Student > Master"=>6, "Other"=>7, "Student > Bachelor"=>7, "Lecturer"=>1}, "reader_count_by_user_role"=>{"Unspecified"=>1, "Professor > Associate Professor"=>2, "Researcher"=>12, "Student > Doctoral Student"=>4, "Student > Ph. D. Student"=>12, "Student > Postgraduate"=>1, "Student > Master"=>6, "Other"=>7, "Student > Bachelor"=>7, "Lecturer"=>1}, "reader_count_by_subject_area"=>{"Unspecified"=>3, "Engineering"=>1, "Environmental Science"=>2, "Agricultural and Biological Sciences"=>19, "Physics and Astronomy"=>1, "Earth and Planetary Sciences"=>27}, "reader_count_by_subdiscipline"=>{"Engineering"=>{"Engineering"=>1}, "Physics and Astronomy"=>{"Physics and Astronomy"=>1}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>27}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>19}, "Unspecified"=>{"Unspecified"=>3}, "Environmental Science"=>{"Environmental Science"=>2}}, "reader_count_by_country"=>{"Colombia"=>1, "Argentina"=>2, "Romania"=>1, "United States"=>1, "Mexico"=>1, "Spain"=>3}, "group_count"=>2}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/423264"], "description"=>"<div><h3>Background</h3><p>Megaloolithid eggs have long been associated with sauropod dinosaurs. Despite their extensive and worldwide fossil record, interpretations of egg size and shape, clutch morphology, and incubation strategy vary. The Pinyes locality in the Upper Cretaceous Tremp Formation in the southern Pyrenees, Catalonia provides new information for addressing these issues. Nine horizons containing <em>Megaloolithus siruguei</em> clutches are exposed near the village of Coll de Nargó. Tectonic deformation in the study area strongly influenced egg size and shape, which could potentially lead to misinterpretation of reproductive biology if 2D and 3D maps are not corrected for bed dip that results from tectonism.</p><h3>Methodology/Findings</h3><p>Detailed taphonomic study and three-dimensional modelling of fossil eggs show that intact <em>M. siruguei</em> clutches contained 20–28 eggs, which is substantially larger than commonly reported from Europe and India. Linear and grouped eggs occur in three superimposed levels and form an asymmetric, elongate, bowl-shaped profile in lateral view. Computed tomography data support previous interpretations that the eggs hatched within the substrate. Megaloolithid clutch sizes reported from other European and Indian localities are typically less than 15 eggs; however, these clutches often include linear or grouped eggs that resemble those of the larger Pinyes clutches and may reflect preservation of incomplete clutches.</p><h3>Conclusions/Significance</h3><p>We propose that 25 eggs represent a typical megaloolithid clutch size and smaller egg clusters that display linear or grouped egg arrangements reported at Pinyes and other localities may represent eroded remnants of larger clutches. The similarity of megaloolithid clutch morphology from localities worldwide strongly suggests common reproductive behaviour. The distinct clutch geometry at Pinyes and other localities likely resulted from the asymmetrical, inclined, and laterally compressed titanosaur pes unguals of the female, using the hind foot for scratch-digging during nest excavation.</p></div>", "links"=>[], "tags"=>["3-d", "megaloolithid", "insights", "dinosaur", "behaviour"], "article_id"=>143584, "categories"=>["Evolutionary Biology", "Cancer"], "users"=>["Bernat Vila", "Frankie D. Jackson", "Josep Fortuny", "Albert G. Sellés", "Àngel Galobart"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0010362", "stats"=>{"downloads"=>5, "page_views"=>12, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/3_D_Modelling_of_Megaloolithid_Clutches_Insights_about_Nest_Construction_and_Dinosaur_Behaviour/143584", "title"=>"3-D Modelling of Megaloolithid Clutches: Insights about Nest Construction and Dinosaur Behaviour", "pos_in_sequence"=>0, "defined_type"=>2, "published_date"=>"2010-05-05 00:59:44"}
  • {"files"=>["https://ndownloader.figshare.com/files/850988"], "description"=>"<p>(A)–Interpreted hatching window in two eggs from clutch 17E04-B. Note the elliptical outline and size of the truncations. Grid squares ∼10 cm. (B)–Rose diagram showing long axis direction for Pinyes eggs. Note the NE-SW alignment, coincident with the tectonic foliation. (C)–Computed Tomography scan images of egg A from cluster 13E02 showing vertical (YZ) cross section (left) and equatorial (XY) cross section (right) with respective three-dimensional miniature render (yellow arrow indicates top of the egg). Note that the grouped eggshell fragments are vertically embedded by sediment. White and red arrows indicate nodules and eggshell pieces, respectively. Scale bars  = 5 cm.</p>", "links"=>[], "tags"=>["pinyes"], "article_id"=>521442, "categories"=>["Evolutionary Biology", "Infectious Diseases"], "users"=>["Bernat Vila", "Frankie D. Jackson", "Josep Fortuny", "Albert G. Sellés", "Àngel Galobart"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0010362.g002", "stats"=>{"downloads"=>1, "page_views"=>4, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Egg_features_at_Pinyes_locality_/521442", "title"=>"Egg features at Pinyes locality.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2010-05-05 00:24:02"}
  • {"files"=>["https://ndownloader.figshare.com/files/850890"], "description"=>"<p>(A)–Geographical and geological location of the locality within Catalonia and the Coll de Nargó nesting area. (B)–Stratigraphical section of the Pinyes locality highlighting the nine egg horizons (see details of sedimentary facies in <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010362#pone.0010362-Jackson2\" target=\"_blank\">[52]</a>, <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010362#pone.0010362-Vila3\" target=\"_blank\">[53]</a>).</p>", "links"=>[], "tags"=>["pinyes"], "article_id"=>521329, "categories"=>["Evolutionary Biology", "Infectious Diseases"], "users"=>["Bernat Vila", "Frankie D. Jackson", "Josep Fortuny", "Albert G. Sellés", "Àngel Galobart"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0010362.g001", "stats"=>{"downloads"=>1, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_General_setting_of_the_Pinyes_locality_/521329", "title"=>"General setting of the Pinyes locality.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2010-05-05 00:22:09"}
  • {"files"=>["https://ndownloader.figshare.com/files/851867"], "description"=>"<p>EUR: Europe, SAM: South-America, IND: India.</p>", "links"=>[], "tags"=>["localities", "megaloolithid", "clutches", "eggs", "levels"], "article_id"=>522312, "categories"=>["Evolutionary Biology", "Infectious Diseases"], "users"=>["Bernat Vila", "Frankie D. Jackson", "Josep Fortuny", "Albert G. Sellés", "Àngel Galobart"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0010362.t002", "stats"=>{"downloads"=>0, "page_views"=>8, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Principal_localities_with_megaloolithid_clutches_indicating_number_of_eggs_per_8220_clutch_8221_egg_levels_and_egg_arrangement_/522312", "title"=>"Principal localities with megaloolithid clutches indicating number of eggs per “clutch”, egg levels and egg arrangement.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2010-05-05 00:38:32"}
  • {"files"=>["https://ndownloader.figshare.com/files/851769"], "description"=>"<p>(A)–Titanosaur female using back foot to excavate nest. (B)–Block diagram showing asymmetrical nest morphology in plan (1) and cross section (2) view. (C)–Titanosaur pes and excavated pit in plan and cross section view (1, 2, respectively). Note the asymmetric feature of the excavated hole in frontal and plan views and reconstructions from <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010362#pone-0010362-g004\" target=\"_blank\">Figure 4</a>. Pedal reconstruction after <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010362#pone.0010362-GonzlezRiga1\" target=\"_blank\">[82]</a>. (D)–Egg clutch produced in mass by female. (E)–Block diagram of nest and eggs showing asymmetrical egg distribution in plan (3), frontal (4) and lateral (5) views. (F)–Egg arrangement within the nest from three views.</p>", "links"=>[], "tags"=>["excavation"], "article_id"=>522217, "categories"=>["Evolutionary Biology", "Infectious Diseases"], "users"=>["Bernat Vila", "Frankie D. Jackson", "Josep Fortuny", "Albert G. Sellés", "Àngel Galobart"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0010362.g007", "stats"=>{"downloads"=>0, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Nest_excavation_and_egg_laying_/522217", "title"=>"Nest excavation and egg laying.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2010-05-05 00:36:57"}
  • {"files"=>["https://ndownloader.figshare.com/files/851201"], "description"=>"<p>(A)–Field photograph of partially excavated eggs from clutch 18E02, shown from a slightly oblique angle. Scale bar  = 15 cm. (B)–Lateral view of the same clutch. Numbers indicate egg levels. Scale bar  = 10 cm. (C)–Under side of the same clutch as revealed during preparation, shown from an oblique angle. Scale bar  = 15 cm. White labels in A and B indicate eggs.</p>", "links"=>[], "tags"=>["clutches", "pinyes"], "article_id"=>521649, "categories"=>["Evolutionary Biology", "Infectious Diseases"], "users"=>["Bernat Vila", "Frankie D. Jackson", "Josep Fortuny", "Albert G. Sellés", "Àngel Galobart"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0010362.g003", "stats"=>{"downloads"=>1, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Individual_clutches_at_Pinyes_locality_/521649", "title"=>"Individual clutches at Pinyes locality.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2010-05-05 00:27:29"}
  • {"files"=>["https://ndownloader.figshare.com/files/851644"], "description"=>"<p>(A)–Field photograph of partially excavated titanosaur nest (NE-01) from Auca Mahuevo locality, Argentina. Scale bar  = 15 cm. (B)–Scheme for the same nest (C)–Pinyes clutch (18E02) morphology inferred after the 3-D model. Note the strong similarity in the elongated kidney-like shape in all three figures. (D)–Published field map and interpreted nest structure in South America (SAM). Modified from Chiappe et al. <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010362#pone.0010362-Chiappe4\" target=\"_blank\">[37]</a>, <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010362#pone.0010362-Chiappe5\" target=\"_blank\">[75]</a>. (E)–Same for megaloolithid eggs from India (IND). Modified from Mohabey <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010362#pone.0010362-Sahni1\" target=\"_blank\">[3]</a>, <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010362#pone.0010362-Mohabey2\" target=\"_blank\">[29]</a>. (F)–Same for megaloolithid eggs from Europe (EUR). Scale bar  = 15 cm (A–C) and 1 meter (D–F).</p>", "links"=>[], "tags"=>["megaloolithid"], "article_id"=>522098, "categories"=>["Evolutionary Biology", "Infectious Diseases"], "users"=>["Bernat Vila", "Frankie D. Jackson", "Josep Fortuny", "Albert G. Sellés", "Àngel Galobart"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0010362.g006", "stats"=>{"downloads"=>1, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_General_pattern_in_megaloolithid_clutches_/522098", "title"=>"General pattern in megaloolithid clutches.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2010-05-05 00:34:58"}
  • {"files"=>["https://ndownloader.figshare.com/files/851433"], "description"=>"<p>(A)–Perspective view of 18E02 (left) and 17E04-B (right), respectively, with indication of the views in B. (B)–Plan, lateral and frontal views for clutches 18E02 and 17E04-B, respectively. Note the similarities between egg arrangements in all views and the bowl-shape, asymmetric geometry. Scale bar  = 50 cm.</p>", "links"=>[], "tags"=>["clutches", "18e02"], "article_id"=>521876, "categories"=>["Evolutionary Biology", "Infectious Diseases"], "users"=>["Bernat Vila", "Frankie D. Jackson", "Josep Fortuny", "Albert G. Sellés", "Àngel Galobart"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0010362.g004", "stats"=>{"downloads"=>2, "page_views"=>11, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_3_D_modelling_of_clutches_18E02_and_17E04_B_/521876", "title"=>"3-D modelling of clutches 18E02 and 17E04-B.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2010-05-05 00:31:16"}
  • {"files"=>["https://ndownloader.figshare.com/files/851533"], "description"=>"<p>(A, C, and E)–Plan view arrangements from Sander et al., <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010362#pone.0010362-Sander1\" target=\"_blank\">[6]</a>, Grigorescu et al., <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010362#pone.0010362-Grigorescu1\" target=\"_blank\">[8]</a> and Kérourio <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010362#pone.0010362-Krourio1\" target=\"_blank\">[25]</a>, and corresponding interpretation of egg arrangements after the Pinyes new clutch morphology, respectively. (B, D, and F)–Lateral view arrangements from the same authors, and interpreted egg arrangements after the Pinyes new clutch morphology, respectively. Scale bar  = 50 cm.</p>", "links"=>[], "tags"=>["arrangements", "pinyes", "clutch", "morphology", "reported"], "article_id"=>521976, "categories"=>["Evolutionary Biology", "Infectious Diseases"], "users"=>["Bernat Vila", "Frankie D. Jackson", "Josep Fortuny", "Albert G. Sellés", "Àngel Galobart"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0010362.g005", "stats"=>{"downloads"=>2, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Comparisons_of_egg_arrangements_at_Pinyes_with_clutch_morphology_reported_from_Europe_/521976", "title"=>"Comparisons of egg arrangements at Pinyes with clutch morphology reported from Europe.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2010-05-05 00:32:56"}
  • {"files"=>["https://ndownloader.figshare.com/files/851912"], "description"=>"<p>Three horizons (0, 2, 4) exhibit fossil material but remain unexplored. Note: Horizons 5–8 are equivalent to horizons 1–4 in <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010362#pone.0010362-Jackson2\" target=\"_blank\">[52]</a>, <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010362#pone.0010362-Vila3\" target=\"_blank\">[53]</a>.</p>", "links"=>[], "tags"=>["eggs"], "article_id"=>522364, "categories"=>["Evolutionary Biology", "Infectious Diseases"], "users"=>["Bernat Vila", "Frankie D. Jackson", "Josep Fortuny", "Albert G. Sellés", "Àngel Galobart"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0010362.t001", "stats"=>{"downloads"=>0, "page_views"=>3, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Pinyes_eggs_and_clusters_/522364", "title"=>"Pinyes eggs and clusters.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2010-05-05 00:39:24"}

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  • {"unique-ip"=>"4", "full-text"=>"4", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"9"}
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  • {"unique-ip"=>"8", "full-text"=>"8", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"12"}
  • {"unique-ip"=>"11", "full-text"=>"9", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"1"}
  • {"unique-ip"=>"6", "full-text"=>"7", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"2"}
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  • {"unique-ip"=>"3", "full-text"=>"3", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"1"}
  • {"unique-ip"=>"7", "full-text"=>"6", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"1", "cited-by"=>"0", "year"=>"2018", "month"=>"3"}
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  • {"unique-ip"=>"5", "full-text"=>"4", "pdf"=>"2", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"10"}
  • {"unique-ip"=>"10", "full-text"=>"11", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"3", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"9"}
  • {"unique-ip"=>"12", "full-text"=>"12", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"12"}
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  • {"unique-ip"=>"10", "full-text"=>"10", "pdf"=>"1", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"2"}
  • {"unique-ip"=>"8", "full-text"=>"10", "pdf"=>"1", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"3"}
  • {"unique-ip"=>"5", "full-text"=>"6", "pdf"=>"1", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"4"}
  • {"unique-ip"=>"8", "full-text"=>"9", "pdf"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"5"}
  • {"unique-ip"=>"6", "full-text"=>"5", "pdf"=>"1", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"8"}
  • {"unique-ip"=>"10", "full-text"=>"10", "pdf"=>"1", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"9"}
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Relative Metric

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