René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"plot.loadReg doesn't produce full set of diagnostic plots","articleBody":"If I run the example from the docs:\r\n\r\n```r\r\ndata(app1.calib)\r\napp1.lr \u003c- loadReg(Phosphorus ~ model(1), data = app1.calib, \r\n                       flow = \"FLOW\", dates = \"DATES\", conc.units=\"mg/L\",\r\n                       station=\"Illinois River at Marseilles, Ill.\")\r\n# Produce the full suite of diagnostic plots\r\nplot(app1.lr)\r\n```\r\n\r\nI get an `Observed vs. fitted` plot but none of the remaining plots. Instead I get an error: \r\n\u003e Warning message:\r\nIn device(width = width, height = height, pointsize = fontSize,  :\r\n  Quartz device is not available on this platform\r\n\r\n\u003cdetails\u003e\u003csummary\u003e platform details\u003c/summary\u003e\r\n\r\n```r\r\n setting  value                       \r\n version  R version 4.0.3 (2020-10-10)\r\n os       Ubuntu 20.04.1 LTS          \r\n system   x86_64, linux-gnu           \r\n ui       RStudio                     \r\n language (EN)                        \r\n collate  en_US.UTF-8                 \r\n ctype    en_US.UTF-8                 \r\n tz       America/New_York            \r\n date     2021-01-18 \r\n```\r\n\r\n\u003c/details\u003e\r\n","author":{"url":"https://github.com/jsta","@type":"Person","name":"jsta"},"datePublished":"2021-01-18T21:34:36.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/36/rloadest/issues/36"}