Double line drawing

[PrudenceXYZ]

How to draw a double line underneath a group of figures?女口

[LeroyG]

https://help.libreoffice.org/latest/en-US/text/shared/01/05110300.html?&DbPAR=CALC

https://help.libreoffice.org/latest/en-US/text/shared/01/05030500.html?&DbPAR=CALC&System=WIN