https://nathaneastwood.r-universe.dev/gghalfnormhttps://nathaneastwood.r-universe.dev/api/packages/gghalfnormhttps://nathaneastwood.r-universe.dev/gghalfnorm/gghalfnorm.pdfhttps://nathaneastwood.r-universe.dev/gghalfnorm/doc/manual.htmlhttps://nathaneastwood.r-universe.dev/gghalfnorm/citationhttps://nathaneastwood.r-universe.dev/gghalfnorm/citation.txthttps://nathaneastwood.r-universe.dev/gghalfnorm/citation.cff