\set StaffGroup.systemStartDelimiter = #'SystemStartBar
\override StaffGroup.SystemStartBar.thickness = #8
\override StaffGroup.SystemStartBar.padding = #0.2
\set StaffGroup.systemStartDelimiter = #'SystemStartBar
\override StaffGroup.SystemStartBar.thickness = #8
\override StaffGroup.SystemStartBar.padding = #0.2