Details:
| png file | /svs/share/houdini/cbars/images/png/CB_BuGn_09.png |
| tex file | /svs/share/houdini/cbars/images/tex/CB_BuGn_09.tex |
| definition | /svs/share/houdini/cbars/definitions/color_brewer_seq/CB_BuGn_09.csv |
| credit | Cynthia Brewer (Penn State) | reference | https://colorbrewer2.org/#type=sequential&scheme=BuGn&n=3 |