What does a joist filler look like?

[SeizeTheMoment]

The SJI mentions fillers and how they are able to alter the effective slenderness ratio used for analyzing a member in compression. I am particularly looking at the bottom chord panel case where it is in compression in the uplift case. I can't find anywhere online what a filler looks like. My interpretation is that these fillers help the individual member from local buckling which is why SJI offers kls/rz for two shapes with fillers or ties, where ls is the distance from panel point to filler. I am assuming it's just a plate or some sort of member that connects two members together?

Thanks in advance

 

[ANE91]

Isn’t a filler just bar material—usually discontinuous—between the angles?

 

[SeizeTheMoment]

Isn’t a filler just bar material—usually discontinuous—between the angles?

that would make sense, what are their typical spacing so that we are allowed to assume they help the two angles from buckling individually? (every midspan between panel pts?)