Before revision:  Such a spanner could withstand a catastrophe: failureof even{\em    90\\%DIF < of the network.
After revision:  Such a spanner could withstand a catastrophe: failureof even{\em for the Euclidean space. A highly desirable feature of a reliable spanner is its ability to withstand a massive failure: the network remains functioning even if 90\\%DIF < of the network.