postReference_focusBars

Four rows of bar pairs, 8 pairs across the top row and doubling on each row below: the focus chart a depth-of-field reading is taken off.

Drawn unlit by @builtin::shaders.referenceChart, so a picture of it is measured against the light its properties state. Part of the post-verification reference scenes (@builtin::scenes.postReference.*); @builtin::modules.postMetrics reads them.