I had a similar question / clarification on pg 304/305 in TFTUA. Was the total vertical for the late base week supposed to be in a single week or two weeks combined (was answered above).
Follow up to this, should we plan on more than 100% race vertical for any given week such as in the “I” or “S” weeks [Fig 11.7 TFTUA]. Keep the same ratio as dist/vert? Thus an 80km “S” week might have 120% of race vertical for that week (if Goal week is 68km). Cheers.