URL: https://www.researchgate.net/publication/221242790/figure/fig1/AS:669024375554059@1536519249849/The-length-of-the-projection-dmn-is-bounded-by-the-great-circle-distance-dm-n-on-the.png
URL2: https://www.researchgate.net/figure/The-length-of-the-projection-dmn-is-bounded-by-the-great-circle-distance-dm-n-on-the_fig1_221242790
