dorico aleatoric music

Greetings,

Can you please tell me how you made the thick lines following the repeat signs? I tried to copy and paste the square note cluster from the page at the link you have provided, but it comes out as a totally different symbol when I paste it. Is there a specific font to be used? Sorry if this is a noob question.

UPD: In the meantime, I have managed to fake it using a graphic frame. Ends up looking like this:


The bad news, of course, is that if relocate anything in the score, I’ll have to adjust the graphic frame manually, which can become painful, considering the fact that I will be using multiple instances of this.

Thanks!