Finding center or midpoint of a slot

dimension given in Figure 14 dimension of pole punching , Figure 14 field slot equivalent resistance of parallel circuit , Figure 13 opening at top

The card's dimensions are 276 mm x 110 mm x 51 mm, and it features a dual-slot cooling solution Graphics Processor GPU Name: Navi 31 Codename: Plum Bonito

dimension a slot I need to dimension to the center of the slot but can't figure out how to generate a line in the center I'm fairly sure the dimension

dimension slot slot=icon-only name=heart>ion-icon> ion-button> ion-button shape Content is placed between the named slots if provided without a slot end