Top Runaround

I need help setting the runaround in Quark
Trying to create textboxes inside a textbox but I need to set my runarounds to 6pt on top and bottom for the new textboxes that are being created. How do I specify that when I am setting up my boxprops

tell Application “QuarkXpress”
set boxprops to {bounds:{Y,X,X+height,width}, runaround: item runaround top “6 pt” bottom “6 pt”, color:none}
make new text box at beginning with properties boxprops
end tell