The return-address paragraph gets fontSize 8pt so its line box is 8pt tall (a 12pt paragraph mark pushed the address zone 1.6mm low), and an info line with no address half indents 10cm instead of leading with a tab (a leading tab stays on the default grid). Measured in Chromium: return address 44.97mm, address zone 49.98mm, info column 124.98mm, fold marks 87/148.5/192mm.