{
    "intro": "<a href='IsoplotR.png'><img src='IsoplotR.png' class='centered' width=800></a> <p></p><i>IsoplotR</i> is a free and open-source substitute for Kenneth Ludwig's popular <i>Isoplot</i> add-in to Microsoft <i>Excel</i>. <i>IsoplotR</i> is programmed in <i>R</i> and can be run in three different modes:<ol><li>Online: A user-friendly Graphical User Interface (GUI) that runs in a web browser on any internet-connected device.</li> <li>Offline: The GUI can be run natively on any computer that has <i>R</i> installed on it. <i>R</i> is free software that is available on Windows, Mac and Linux/Unix.</li><li>Command Line: Advanced users can access the full functionality of <i>IsoplotR</i> from <i>R</i>'s command line. This enables <i>IsoplotR</i> to be extended and incorporated into automation scripts.</li></ol>",
    "reference": "Citable reference:",
    "intro_tab": "Introduction",
    "online": "An online GUI is hosted by the following international collaborators:<ol><li><a href='http://isoplotr.es.ucl.ac.uk/'>London</a> (UK): Pieter Vermeesch (University College London)</li><li><a href='http://isoplotr.bgs.ac.uk/'>Keyworth</a> (UK): Ian Millar (British Geological Survey)</li><li><a href='http://isoplotr.geo.utexas.edu/'>Austin</a> (USA): Daniel Stockli (University of Texas)</li><li><a href='http://www.isoplotr.com/isoplotr/'>Beijing</a> (China): Yang Li (Chinese Academy of Sciences)</li><li><a href='https://isoplotr.sysu.edu.cn/isoplotr/'>Guangzhou</a> (China): Dengfeng Li (Sun Yat-Sen University)</li><li><a href='http://isoplotr.lithodat.com'>Melbourne</a> (Australia): Fabian Kohlmann (Lithodat)</li><li><a href='https://isoplotr.geoaltay.eu/'>Prague</a> (Czech Republic): Ondrej Lexa (Univerzita Karlova)</li><li><a href='http://isoplotr.lateandes.com/'>Salta</a> (Argentina): Sof&iacute;a Bordese (LA.TE.ANDES)</li>  <li><a href='http://isoplotr.geol.ucsb.edu/isoplotr/'>Santa Barbara</a> (USA): John Cottle (University of California)</li></ol>Click on one of the yellow boxes below to select a nearby mirror:",
    "online_tab": "Online",
    "extra_mirrors": "If you would like to make your own <tt>IsoplotR</tt> mirror available to the world via this website, then please get in touch with me at <i>p.vermeesch [at] ucl.ac.uk</i>.",
    "offline_tab": "Offline",
    "offline_1": "To run the offline version of the program, install <i>R</i> from <a href='http://r-project.org'>http://r-project.org</a> and enter the following command at the prompt:",
    "offline_2": "Once the package has been installed, you can run the browser-based graphical user interface by typing:",
    "offline_3": "This will open a new tab in your internet browser. To stop the GUI, enter the following command at the prompt:",
    "contribute": "<p></p>Users can contribute to <tt>IsoplotR</tt>'s development in a number of ways:<ol>  <li>Any feedback and bug reports are gratefully accepted. If you encounter any problems, then please send a reproducible example in a <tt>.csv</tt> (if you use the command line) or <tt>.json</tt> (if you use the GUI) format to <i>p.vermeesch [at] ucl.ac.uk</i> and I will get back to you asap.  </li>  <li>If you know how to program in <tt>R</tt>, then feel free to fork <tt>Isoplot</tt>'s <a href='https://www.github.com/pvermees/IsoplotR'>source code</a> from GitHub and modify or recycle it. Submit a pull request if you have fixed a bug.  </li>  <li>Host a local mirror version of the online GUI. This will increase the responsiveness of the site outside the United Kingdom. <a href='https://github.com/pvermees/IsoplotRgui#setting-up-your-own-online-mirror'>Installation instructions</a> are provided on GitHub.  </li>  <li>Translate the user interface into a new language. Contact <i>p.vermeesch [at] ucl.ac.uk</i> to get started.  </li>  <li>IsoplotR is and always will be free to use. However, the development of the code and maintenance of the server infrastructure do take time and money. If you would like to make a financial contribution, then please click the button below. Cheers!<div style='text-align:center;'>      <a href='https://aoc.ucl.ac.uk/alumni/donations-gbp-single?id=cb52e5e1-431e-41bd-b21c-f9615f9b88b1' class='ui-button ui-widget ui-corner-all'>GIVE NOW</a>    </div>  </li></ol>",
    "commandline_tab": "Command Line",
    "news_tab": "News",
    "contribute_tab": "Contribute",
    "commandline_1": "The full functionality of <i>IsoplotR</i> can be accessed from the command line. This includes all the functions and options that are available through the GUI, and more. After installing <i>R</i> on your system from <a href='http://r-project.org'>http://r-project.org</a>, the command line functionality can be installed from <a href='https://github.com/pvermees/IsoplotR/'>Github</a> as described under the <i>Offline</i> tab. Alternatively, <i>IsoplotR</i> can also be installed from the Comprehensive R Archive Network (CRAN) by typing:",
    "commandline_2": "Example code to reproduce the figures in the <a href='https://pieter-vermeesch.es.ucl.ac.uk/papers/VermeeschGSF2018/'>paper</a>:",
    "commandline_3": "Full documentation with additional examples can be viewed <a href='https://cran.r-project.org/web/packages/IsoplotR/IsoplotR.pdf'>on CRAN</a>.",
    "news_1": "IsoplotR is incrementally updated on <a href='http://github.com/pvermees/IsoplotR'>GitHub</a>, as detailed in the change log there. Updates to the <a href='https://CRAN.R-project.org/package=IsoplotR'>CRAN</a> version are less frequent and are reported below.<p></p>The program has benefited from feedback by ",
    "news_2": ".<h3>Update history and other events</h3><p></p><span class='stamp'>October 24, 2025</span> (v.6.8): Fixed error propagation of pooled age for ICP-MS based fission track data; anchors Pb-Pb isochrons in 2D; adds external error option to fission track age calculator and Th/Pb weighted means.<p></p><span class='stamp'>July 23, 2025</span> (v.6.7): Added command line options to omit titles. Improved Bayesian credible intervals for disequilibrium correct U-Pb isochrons.<p></p><span class='stamp'>May 4, 2025</span> (v.6.6): Input tables can now be sorted by clicking the column headers. Adds pooled ages to fission track radial plots. Adds an option to change the 'sister' isotope in K-Ca isochrons; Fixes some issues with model-3a inverse isochron regression; Fixes a wacky equiline in Th-U isochron plots with colour bars.<p></p><span class='stamp'>Jan 25, 2025</span> (v.6.5): Fixes problems with the time axis of inverse isochrons with colour bars. More robust (if slower) concordia age initialisation. Adds discordance filter to concordia diagram options.<p></p><span class='stamp'>Oct 19, 2024</span> (v.6.4): Added custom x-axis limits to radial plots plus age and activity grids in evolution diagrams. Increased robustness of U-Pb age calculator to missing data. Cleaned up leftover normalisations to <sup>192</sup>Os.<p></p><span class='stamp'>Aug 26, 2024</span> (v.6.3): Minor tweaks to anchored isochron regression algorithm.<p></p><p></p><span class='stamp'>May 4, 2024</span> (v.6.2): Adds optional time axis to inverse isochrons. Changes ICP zeta from pooled to central value. Tweaks to the model-3 isochron regression algorithm.<p></p><span class='stamp'>March 13, 2024</span>: The BGS mirror is restored, with a new URL: <a href='https://isoplotr.bgs.ac.uk'>https://isoplotr.bgs.ac.uk</a><p></p><span class='stamp'>February 16, 2024</span> (v.6.1): Adds four new U-Pb formats for decoupled <sup>206</sup>Pb/<sup>238</sup>U and <sup>207</sup>Pb/<sup>235</sup>U dating. Makes the Th/U ratio optional for U-Pb formats 8, 11 and 12. No longer applies a common Pb correction to discordia fits.<p></p><span class='stamp'>December 6, 2023</span> (v.6.0): Adds anchored regression option to Pb-Pb, Th-Pb, Ar-Ar, K-Ca, Rb-Sr, Sm-Nd, Re-Os, Lu-Hf and U-Th-He isochrons; automatically attributes the uncertainty of the anchors to dispersion under model-3 regression; flips the <sup>208</sup>Pb/<sup>206</sup>Pb and <sup>208</sup>Pb/<sup>207</sup>Pb ratios in the settings; adds option to anchor the common Pb composition of a U-Pb isochron to the Stacey-Kramers mantle evolution model.<p></p><span class='stamp'>Nov 17, 2023</span>: A new mirror comes online, hosted by Lithodat in Melbourne, Australia: <a href='https://isoplotr.lithodat.com'>https://isoplotr.lithodat.com</a><p></p><span class='stamp'>Oct 28, 2023</span>: (v.5.6) Added KDE mode identification option; improved robustness of Ludwig regression for U-Pb formats 1, 2 and 3.<p></p><span class='stamp'>Sept 27, 2023</span>: (v.5.5) Redefined the Aitchison and concordia distances in terms of isometric logratios. Modified the default cutoffs accordingly.<p></p><span class='stamp'>Aug 29, 2023</span>: Ondrej Lexa hosts a new mirror at Univerzita Karlova in Prague, Czech Republic: <a href='https://isoplotr.geoaltay.eu'>https://isoplotr.geoaltay.eu</a>.<p></p><span class='stamp'>Aug 28, 2023</span>: (v.5.4) Renamed helioplot 'central' ages as 'barycentric' ages; added OGLS regression to 'Other' data.<p></p><span class='stamp'>May 18, 2023</span>: (v.5.3) Improved model-3 regression for York and Ludwig algorithms.<p></p><span class='stamp'>Mar 4, 2023</span>: (v.5.2) Adds Wasserstein distance to MDS plots; propagates disequilibrium activity ratio errors for U-Pb isochrons, as well as common-Pb and concordia age anchor errors. Replaces ordinary with total least squares in model-2 regression. Recasts model-3 regression terms of ages rather than y-intercepts. Switches back to Isoplot-style Studentised confidence intervals as a default.<p></p><span class='stamp'>Oct 20, 2022</span>: (v.5.1) Bug fixes to 5.0.<p></p><span class='stamp'>Sept 13, 2022</span>: (v.5.0) Errors are now reported as absolute and relative uncertainties at 1&sigma;, 2&sigma; and arbitrary confidence levels. Improved security by the use of <tt>shinylight</tt> under the hood of <tt>IsoplotRgui</tt>. Replaced <tt>.png</tt> with <tt>.svg</tt> graphics. Fixes small but nasty bug in the minimum age algorithm.<p></p><span class='stamp'>May 21, 2022</span>: (v.4.4) Additional options for U-series evolution diagrams and isochron plots, including initial <sup>230</sup>Th-corrections based on the magmatic Th/U activity ratio.<p></p><span class='stamp'>Mar 3, 2022</span>: (v.4.3) Fixed issue with detrital Stacey-Kramers correction, removed gradient function from Ludwig regression.<p></p><span class='stamp'>Oct 20, 2021</span>: (v.4.2) Added 2D U-Pb isochron regression.<p></p><span class='stamp'>Jul 9, 2021</span>: (v.4.1) Removed student t-multiplier from confidence intervals, improved corrections for secular disequilibrium and common Pb.<p></p><span class='stamp'>Jun 6, 2021</span>: (v.4.0) Expanded API; more robust handling of measured initial U-Pb disequilibrium; lots of minor bug fixes.<p></p><span class='stamp'>Apr 5, 2021</span>: (v.3.8) Calculates intercepts of Pb-Pb isochrons with Stacey-Kramers mantle evolution curve; adds Th-Pb dataset to examples; fixes colour scale of radial plots.<p></p><span class='stamp'>Apr 1, 2021</span>: Dengfeng Li hosts a new mirror at Sun Yat-Sen University in Guangzhou (China): <a href='https://isoplotr.sysu.edu.cn/isoplotr/'>https://isoplotr.sysu.edu.cn/isoplotr/</a><p></p><span class='stamp'>Mar 15, 2021</span>: (v.3.7) Changed overdispersion reporting threshold for model-1 regression from MSWD-based to p-value based. Simplified API for anchored discordia regression.<p></p><span class='stamp'>Dec 17, 2020</span>: (v.3.6) Formally added rug plot option to KDEs. Upgraded mirrors to shinyless version, increased robustness of disequilibrium correction, updated whitelist of allowable functions.<p></p><span class='stamp'>Nov 10, 2020</span>: (v.3.5) Minor bug fixes. Compatible with `shinyless' <tt>IsoplotRgui</tt><p></p><span class='stamp'>Sep 10, 2020</span>: Danny Stockli hosts a new mirror at UT Austin: <a href='http://isoplotr.geo.utexas.edu'>http://isoplotr.geo.utexas.edu</a>.</span><p></p><span class='stamp'>Jul 8, 2020</span> (v.3.4): Adds options to change the stroke colour of error ellipses (API change); introduces a log-transform to the random effects model for weighted means; and replaces the three parameter minimum age algorithm with a four parameter alternative.</span><p></p><span class='stamp'>May 4, 2020</span>: LA.TE.ANDES host a new <tt>IsoplotR</tt> mirror in Salta, Argentina: <a href='http://isoplotr.lateandes.com/'>http://isoplotr.lateandes.com/<a><p></p><span class='stamp'>Mar 18, 2020</span> (v.3.3): Adds Th-Pb geochronology to the toolbox.<p></p><span class='stamp'>Jan 25, 2020</span>: Release of a Chinese language version of the graphical user interface. Thanks to Shuan Yan (Guangzhou), Pei Zhang and Hao Fang (Beijing), Qiuye Yu (Changsha), Hongcheng Guo (Lehigh), and Shihu Li (Lancaster) for the translation!<p></p><span class='stamp'>Jan 22, 2020</span> (v.3.2): Fixes several minor bugs and increases stability.<p></p><span class='stamp'>Oct 30, 2019</span>: Yang Li and Liguang Wu host a new <tt>IsoplotR</tt> mirror at the Chinese Academy of Sciences in Beijing: <a href='http://www.isoplotr.com/isoplotr/'> http://www.isoplotr.com/isoplotr/<a><p></p><span class='stamp'>Oct 8, 2019</span> (v.3.1): Unified Ludwig regression, including a new model-3 option that redefines the overdispersion parameter in terms of time rather than common Pbcomposition.  Various minor bug fixes.<p></p><span class='stamp'>Aug 5, 2019</span> (v.3.0): Adds isochrons for U-(Th-)Pb data, implements U-Pb initial disequilibrium corrections using matrix exponentials, completely rewritten Ludwig regression functions.<p></p><span class='stamp'>Jun 6, 2019</span> (v2.7): Adds new input format for U-Pb data that include <sup>208</sup>Pb and <sup>232</sup>Th; option to perform discordance filter before common Pb correction. This update changes the <tt>.json</tt> format, which may cause problemsfor data saved in previous <tt>IsoplotR</tt> versions.<p></p><span class='stamp'>May 24, 2019</span>: Addition of an American <tt>IsoplotR</tt> mirror at UC Santa Barbara:<br><a href='http://isoplotr.geol.ucsb.edu/isoplotr/'>http://isoplotr.geol.ucsb.edu/isoplotr/</a><p></p><span class='stamp'>May 4, 2019</span> (v2.6): Adds inverse isochron option to K-Ca, Rb-Sr, Sm-Nd, Lu-Hf and Re-Os data. Improved dispersion estimates in model-3 regression.<p></p><span class='stamp'>Apr 11, 2019</span>: Two new mirror <tt>IsoplotR</tt> sites come online:<br>UK (BGS): <a href='https://shiny.bgs.ac.uk/IsoplotR/'> https://shiny.bgs.ac.uk/IsoplotR/</a><br>China (Qiuye Yu): <a href='http://chinageology.org:8080/'>http://chinageology.org:8080/</a><p></p><span class='stamp'>Apr 3, 2019</span> (v2.5): Several improvements, especially for the common-Pb corrections, which improve <tt>IsoplotR</tt>'s robustness to very discordant data. Prepared in the run-up to the detrital zircon U-Pb dating workshop at the Beijing SHRIMP centre.<p></p><span class='stamp'>Mar 4, 2019</span> (v2.4): Implements initial disequilibrium corrections for U-Pb data, improved common Pb-corrections and initial ('common') non-radiogenic isotope compositions for other chronometers; increases robustness of the mixture modelling functions.<p></p><span class='stamp'>Dec 8, 2018</span> (v2.3): Allows input uncertainties to be specified as absolute and relative errors at 1 or 2&sigma;.<p></p><span class='stamp'>Nov 9, 2018</span> (v2.2): Adds ability to hide or omit samples from plots and calculations.<p></p><span class='stamp'>Oct 20, 2018</span> (v2.1): Rewrote discordia regression function, which now uses the same maximum likelihood approach for 2D and 3D regression.  Added option to anchor the discordia line to the concordia line, or to a specificy common Pb composition.<p></p><span class='stamp'>Sep 10, 2018</span> (v2.0): Adds K-Ca geochronology to the toolbox.<p></p><span class='stamp'>Aug 13, 2018</span> (v1.4): Adds options for detrital <sup>230</sup>Th-corrections from assumed or measured detritus; more flexible weighted mean plots.<p></p><span class='stamp'>Jun 4, 2018</span> (v1.3): Includes bug fixes relating to the 'York fit' algorithm and error formatting, and added functionality for Stacey-Kramers evolution curves and ordinary weighted mean calculation.<p></p><span class='stamp'>May 1, 2018</span> (v1.2): Includes bug fixes relating to the MSWD of isochrons, and discordia lines in Tera-Wasserburg space. Improved flexibility for loading data from Rmatrices and data frames.<p></p><span class='stamp'>Apr 11, 2018</span>: IsoplotR formally introduced to the Geoscience community at <a href='https://meetingorganizer.copernicus.org/EGU2018 EGU2018-3088.pdf'>EGU</a> (Vienna).<p></p><span class='stamp'>Apr 3, 2018</span>: IsoplotR <a href='https://pieter-vermeesch.es.ucl.ac.uk/papers/VermeeschGSF2018/'>paper</a> accepted for publication in <i>Geoscience Frontiers</i> (a free and open journal for free and open software).",
    "and": "and",
    "CAS": "Beijing",
    "SYSU": "Guangzhou",
    "title": "a free and extendable toolbox for geochronology",
    "translate_button": "<a class='translatelink' href='${LINK}' title='Please follow this link to help translate this text'>TRANSLATE</a>"
}
