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Each split is what that kilometre takes at the chosen effort, given its climb, the wind along it, and the temperature and sun at the time you get there. Run to effort on the hills, not to the split - the split is how long the right effort will take, not a target to chase.
Anything left blank uses the coach's reading (or the forecast). Anything you fill in wins until you clear it. Weather you enter is held constant for the whole race.