A instant vector (or vector) might be:

metric{foo="bar"} 3.0

metric{foo="baz"} 9.7

A range vector might be:

metric{foo="bar"} 2.5@1463055525000 3.0@1463055585000

metric{foo="baz"} 9.5@1463055527000 9.7@1463055587000

Note that the timestamps (the numbers after the @) don't have to match up across a range vector.