In the Houdini colorbar HDA, replace the menus selections with red arrows below with the selections above

png file /svs/share/houdini/cbars/images/png/MLS_CO_215hPa.png
tex file /svs/share/houdini/cbars/images/tex/MLS_CO_215hPa.tex
definition /svs/share/houdini/cbars/definitions/gibs/MLS_CO_215hPa.xml
credit unknown
reference https://gibs.earthdata.nasa.gov/colormaps/v1.0/