Caption: "Global sea level rise 1993--2014. Data from Neil White of the Commonwealth Scientific and Industrial Research Organisation (CSIRO), originally obtained by satellites TOPEX/Poseidon, Jason-1, and Jason 2." (Somewhat edited.)
Features:
There must be an elaborate procedure for arriving at an average sea level.
But the rise rate is NOT expected to stay constant. So the 26 cm prediction is NOT robust.