@FredKiesche @nyrath

In an exploratory sector (South, Rimward, *and*Trailing, iirc, so far from the beaten-path, an unrecovered sector), we had centuries-old (pre-collapse) Imperial Scout Service notes on the 3 possible intermediate-jump systems; Scout was apparently not impressed, their notes were one word only each:
Water.
Sand.
Ice.
For refueling purposes, we picked Water, as we didn't fancy chopping or melting ice; may have missed discovering the Spice planet? ;-)