Floating bar

Proc Graph0() : Graph
    
    make/t/o categoryWave={"A","B","C","D","E","F","G"}
    make/o lower={510,620,740,670,790,790,800}
    make/o upper={650,770,790,940,900,900,1000}
    upper -= lower
    
    PauseUpdate; Silent 1       // building window...
    Display /W=(35,44,346,350)/VERT upper,lower vs categoryWave
    ModifyGraph gFont="Helvetica Neue",width=255.118,height=255.118
    ModifyGraph rgb(upper)=(0,0,65535)
    ModifyGraph hbFill(upper)=2
    ModifyGraph toMode(upper)=2
    ModifyGraph hideTrace(lower)=1
    ModifyGraph tick(left)=3,tick(bottom)=2
    ModifyGraph mirror=2
    ModifyGraph nticks(bottom)=10
    ModifyGraph standoff=0
    ModifyGraph catGap(left)=0.6
    ModifyGraph manTick(bottom)={500,250,0,0},manMinor(bottom)={1,0}
    SetAxis/A/R left
    SetAxis bottom 400,1020
EndMacro