https://bcohen0901.r-universe.dev/pecanrhttps://bcohen0901.r-universe.dev/api/packages/pecanrhttps://bcohen0901.r-universe.dev/pecanr/pecanr.pdfhttps://bcohen0901.r-universe.dev/pecanr/doc/manual.htmlhttps://bcohen0901.r-universe.dev/pecanr/NEWShttps://bcohen0901.r-universe.dev/pecanr/NEWS.txthttps://bcohen0901.r-universe.dev/pecanr/citationhttps://bcohen0901.r-universe.dev/pecanr/citation.txthttps://bcohen0901.r-universe.dev/pecanr/citation.cff